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Deb Cotton Secondline Collection
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Source: https://www.youtube.com/watch?v=kzgE3ryoHl0 Uploader: BigRedCotton Upload date: 20130421
Topics: Youtube, video, Music, Hot 8 Brass Band, Bennie Pete, Sammy Cyrus, John Prince Gilbert, Harry Cook,...
Arxiv.org
by Tizita Nesibu Shewaye
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This work presents an automatic human gender and age group recognition system based on human facial images. It makes an extensive experiment with row pixel intensity valued features and Discrete Cosine Transform (DCT) coefficient features with Principal Component Analysis and k-Nearest Neighbor classification to identify the best recognition approach. The final results show approaches using DCT coefficient outperform their counter parts resulting in a 99% correct gender recognition rate and 68%...
Source: http://arxiv.org/abs/1304.0019v1
Arxiv.org
by Tarek Sayed Ahmed
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We show that cylindric polyadic algebras introduced by Ferenczi has the superamalgmation property. We give two proofs. One is a Henkin construction, and the other is inspired by duality theory in modal logic between finite zig zag products of Kripke frames and their complex algebras.
Source: http://arxiv.org/abs/1304.0724v1
Arxiv.org
by Andre Walker-Loud
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Anchoring our understanding of low-energy nuclear and hadronic physics to the fundamental theory of strong interactions, QCD, remains and outstanding challenge for physicists. Lattice QCD and chiral perturbation theory are the most powerful theoretical tools we have at our disposal to make this connection. These tools share a symbiotic relationship as chiral perturbation theory is used to understand the light quark mass dependence of observables, while lattice QCD is used to determine the...
Source: http://arxiv.org/abs/1304.6341v2
Arxiv.org
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We combine the finite size scaling method with the meshfree spectral method to calculate quantum critical parameters for a given Hamiltonian. The basic idea is to expand the exact wave function in a finite exponential basis set and extrapolate the information about system criticality from a finite basis to the infinite basis set limit. The used exponential basis set -though chosen intuitively- allows handling a very wide range of exponential decay rates and calculating multiple eigenvalues...
Source: http://arxiv.org/abs/1304.7433v1
Arxiv.org
by Marcelo Lanzilotta; Octavio Mendoza; Corina Sáenz
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Let $\Gamma$ and $\Lambda$ be artin algebras such that $\Gamma$ is a split-by-nilpotent extension of $\Lambda$ by a two sided ideal $I$ of $\Gamma.$ Consider the so-called change of rings functors $G:={}_\Gamma\Gamma_\Lambda\otimes_\Lambda -$ and $F:={}_\Lambda \Lambda_\Gamma\otimes_\Gamma -.$ In this paper, we find the necessary and sufficient conditions under which a stratifying system $(\Theta,\leq)$ in $\modu\Lambda$ can be lifted to a stratifying system $(G\Theta,\leq)$ in...
Source: http://arxiv.org/abs/1304.5289v1
Arxiv.org
by Todor V. Veltchev; Sava Donkov; Ralf S. Klessen
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The statistical approach for derivation of the clump mass function (ClMF) developed by Donkov, Veltchev & Klessen is put to observational test through comparison with mass distributions of clumps from molecular emission and dust continuum maps of Galactic cloud complexes, obtained by various authors. The results indicate gravitational boundedness of the dominant clump population, with or without taking into account the contribution of their thermal and magnetic energy. The ClMF can be...
Source: http://arxiv.org/abs/1304.5902v2
Arxiv.org
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The drawdown process $Y=\bar{X}-X$ of an one-dimensional regular diffusion process $X$ is given by $X$ reflected at its running maximum $\bar{X}$. The drawdown process $\hat{Y}=X-\ul{X}$ is given by $X$ reflected at its running minimum $\ul{X}$. In this paper we calculate the probability of the event $\{\sigma_a 0$, where $\sigma_a$ and $\hat{\sigma}_b$ respectively denote the first passage times of $Y$ and $\hat{Y}$ to $a$ and $b$, and $\mathbf{e}_q$ is an exponential random variable which is...
Source: http://arxiv.org/abs/1304.8093v1
Arxiv.org
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This paper studies diffusion processes constrained to the positive orthant under infinitesimal changes in the drift. Our first main result states that any constrained function and its (left) drift-derivative is the unique solution to an augmented Skorohod problem. Our second main result uses this characterization to establish a basic adjoint relationship for the stationary distribution of the constrained diffusion process jointly with its left-derivative process.
Source: http://arxiv.org/abs/1107.2871v2
Arxiv.org
by Gareth. D. Dickenson; Ming Li Niu; Edcel J. Salumbides; Jacek Komasa; Kjeld S. E. Eikema; Krzysztof Pachucki; Wim Ubachs
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The fundamental ground tone vibration of H2, HD, and D2 is determined to an accuracy of 2 x 10^-4 cm^-1 from Doppler-free laser spectroscopy in the collisionless environment of a molecular beam. This rotationless vibrational splitting is derived from the combination difference between electronic excitation from the X^1Sg+, v=0 and v=1 levels to a common EF^1g+, v=0 level. Agreement within $1\sigma$ between the experimental result and a full ab initio calculation provides a stringent test of...
Source: http://arxiv.org/abs/1304.6390v1
Arxiv.org
by Atefeh Javadi; Jacco Th. van Loon; Habib Khosroshahi; Mohammad Taghi Mirtorabi
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We have conducted a near-infrared monitoring campaign at the UK InfraRed Telescope (UKIRT), of the Local Group spiral galaxy M33 (Triangulum). The main aim was to identify stars in the very final stage of their evolution, and for which the luminosity is more directly related to the birth mass than the more numerous less-evolved giant stars that continue to increase in luminosity. In this third paper of the series, we measure the dust production and rates of mass loss by the pulsating Asymptotic...
Source: http://arxiv.org/abs/1304.3782v1
Arxiv.org
by S. Leurini; C. Codella; A. Gusdorf; L. Zapata; A. Gomez-Ruiz; L. Testi; T. Pillai
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Studies of molecular outflows in high-mass young stellar objects reveal important information about the formation process of massive stars. We therefore selected the close-by IRAS 17233-3606 massive star-forming region to perform SiO observations with the SMA interferometer in the (5-4) line and with the APEX single-dish telescope in the (5-4) and (8-7) transitions. In this paper, we present a study of one of the outflows in the region, OF1, which shows several properties similar to jets driven...
Source: http://arxiv.org/abs/1304.4401v1
Arxiv.org
by A. Filipuzzi; J. Portoles; P. Ruiz-Femenia
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The existence of a new strong interacting sector around E ~ 1 TeV is a common feature of Higgsless electroweak theories but also of theories with a light Higgs, for instance, when this is not elementary. In those schemes, this new interaction could be at the origin of an extended spectra with, in particular, spin-1 resonances that could be hinted in elastic gauge boson scattering. Information on those resonances, if they exist, must be contained in the low-energy couplings of the electroweak...
Source: http://arxiv.org/abs/1304.0080v1
Arxiv.org
by Eunjung Kim; Vito Rebecca; Inna V. Fedorenko; Jane L. Messina; Rahel Mathew; Silvya S. Maria-Engler; David Basanta; Keiran S. M. Smalley; Alexander R. A. Anderson
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Skin is one of the largest human organ systems whose primary purpose is the protection of deeper tissues. As such, the skin must maintain a homeostatic balance in the face of many microenvironmental and genetic perturbations. At its simplest, skin homeostasis is maintained by the balance between skin cell growth and death such that skin architecture is preserved. This study presents a hybrid multiscale mathematical model of normal skin (vSkin). The model focuses on key cellular and...
Source: http://arxiv.org/abs/1304.1054v1
Arxiv.org
by Ivan S. Grudinin; Guoping Lin; Nan Yu
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Whispering gallery modes in birefringent crystalline resonators are investigated. We experimentally investigate the XY--cut resonators made with LiNbO$_3$, LiTaO$_3$ and BBO and observe strong influence of the resonator's shape and birefringence on the quality factor of the extraordinary polarized modes. We show that extraordinary modes can have lower Q and even be suppressed due to polarization conversion loss. The ordinary ray modes retain the high Q due to inhibited reflection phenomenon.
Source: http://arxiv.org/abs/1304.1046v1
Arxiv.org
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The existence of complete Radner equilibria is established in an economy which parameters are driven by a diffusion process. Our results complement those in the literature. In particular, we work under essentially minimal regularity conditions and treat time-inhomogeneous case.
Source: http://arxiv.org/abs/1304.3516v1
Arxiv.org
by Shuchao Li; Yibing Song; Bing Wei
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Let $G = (V_G,E_G)$ be a simple connected graph. The eccentric distance sum of $G$ is defined as $\xi^d(G)=\sum_{v \in V_G}\,\varepsilon_G(v)D_G(v),$ where $\varepsilon_G(v)$ is the eccentricity of the vertex $v$ and $D_G(v)=\sum_{u \in V_G}\,d(u,v)$ is the sum of all distances from the vertex $v$. In this paper, we characterize $n$-vertex unicyclic graphs with given matching number having the minimal and second minimal eccentric distance sums, respectively.
Source: http://arxiv.org/abs/1304.4335v1
Arxiv.org
by Dragan Mihailovic; Tomaz Mertelj; Viktor V Kabanov; Serguei Brazovskii
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The control of condensed matter systems out of equilibrium by laser pulses allows us to investigate the system trajectories through symmetry-breaking phase transitions. Thus the evolution of both collective modes and single particle excitations can be followed through diverse phase transitions with femtosecond resolution. Here we present experimental observations of the order parameter trajectory in the normal-superconductor transition and charge-density wave ordering transitions. Of particular...
Source: http://arxiv.org/abs/1304.6968v1
Arxiv.org
by Lingguang Li
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Let $R$ be a Noetherian ring, $M$ an Artinian $R$-module, $\p\in\Cos_RM$. Then $\cograde_{R_{\p}}\Hom_{R}(R_{\p},M)=\inf\{i | \pi_{i}(\p,M)>0\}$ and $$\pi_{i}(\p,M)>0\Rightarrow\cograde_{R_{\p}}\Hom_{R}(R_{\p},M)\leq i\leq\fd_{R_{\p}}\Hom_{R}(R_{\p},M),$$ where $\pi_{i}(\p,M)$ is the $i$-th dual Bass number of $M$ with respect to $\p$, the integer $\cograde_{R_{\p}}\Hom_{R}(R_{\p},M)$ is the common length of any maximal $\Hom_{R}(R_{\p},M)$-quasi co-regular sequence contained in $\p...
Source: http://arxiv.org/abs/1005.1754v5
Arxiv.org
by Stéphane Gaussent; Yves Guiraud; Philippe Malbos
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A coherent presentation of a monoid is an extension of a presentation of this monoid by a homotopy basis, making a natural cellular complex associated to the presentation contractible. In the case of Artin monoids, we show that the usual presentation defined by Artin, using braid relations, can be completed in a coherent presentation that we give in an explicit way. To be able to handle presentations that are not confluent, we develop a homotopical completion-reduction procedure that combines...
Source: http://arxiv.org/abs/1203.5358v2
Arxiv.org
by Valeria Banica; Luis Vega
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In this article we consider the initial value problem of the binormal flow with initial data given by curves that are regular except at one point where they have a corner. We prove that under suitable conditions on the initial data a unique regular solution exists for strictly positive and strictly negative times. Moreover, this solution satisfies a weak version of the equation for all times and can be seen as a perturbation of a suitably chosen self-similar solution. Conversely, we also prove...
Source: http://arxiv.org/abs/1304.0996v1
Arxiv.org
by Qi-Li Liao; Xing-Gang Wu; Jun Jiang; Gu Chen; Zhen-Yun Fang
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The production of the heavy charmonium and $(c\bar{b})$-quarkonium, through the top quark semi-exclusive decays via the flavor changing neutral currents (FCNC), has been systematically studied within the non-relativistic QCD. In different to the conventional squared amplitude approach, to simplify the results as much as possible, we adopt the `improved trace technology' to do our calculation, which deals with the hard scattering directly at the amplitude level. If assuming the higher excited...
Source: http://arxiv.org/abs/1304.1303v1
Arxiv.org
by Tiberiu Harko; Francisco S. N. Lobo; M. K. Mak
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Using N. Euler's theorem on the integrability of the general anharmonic oscillator equation \cite{12}, we present three distinct classes of general solutions of the highly nonlinear second order ordinary differential equation $\frac{d^{2}x}{dt^{2}}+f_{1}\left(t\right) \frac{dx}{dt}+f_{2}\left(t\right) x+f_{3}\left(t\right) x^{n}=0$. The first exact solution is obtained from a particular solution of the point transformed equation $d^{2}X/dT^{2}+X^{n}\left(T\right) =0$, $n\notin...
Source: http://arxiv.org/abs/1304.1468v1
Arxiv.org
by Johanna D. García-Saldaña; Armengol Gasull; Hector Giacomini
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We consider the 1-parameter family of planar quintic systems, $\dot x= y^3-x^3$, $\dot y= -x+my^5$, introduced by A. Bacciotti in 1985. It is known that it has at most one limit cycle and that it can exist only when the parameter $m$ is in $(0.36,0.6)$. In this paper, using the Bendixon-Dulac theorem, we give a new unified proof of all the previous results, we shrink this to $(0.547,0.6)$, and we prove the hyperbolicity of the limit cycle. We also consider the question of the existence of...
Source: http://arxiv.org/abs/1304.2163v1
Arxiv.org
by E. I. Jafarov; J. Van der Jeugt
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We investigate an algebraic model for the quantum oscillator based upon the Lie superalgebra sh(2|2), known as the Heisenberg-Weyl superalgebra or "the algebra of supersymmetric quantum mechanics", and its Fock representation. The model offers some freedom in the choice of a position and a momentum operator, leading to a free model parameter gamma. Using the technique of Jacobi matrices, we determine the spectrum of the position operator, and show that its wavefunctions are related to...
Source: http://arxiv.org/abs/1304.3295v2
Arxiv.org
by Giovanni Geraci; Romain Couillet; Jinhong Yuan; Merouane Debbah; Iain B. Collings
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In this paper, we study the performance of regularized channel inversion (RCI) precoding in large MISO broadcast channels with confidential messages (BCC). We obtain a deterministic approximation for the achievable secrecy sum-rate which is almost surely exact as the number of transmit antennas $M$ and the number of users $K$ grow to infinity in a fixed ratio $\beta=K/M$. We derive the optimal regularization parameter $\xi$ and the optimal network load $\beta$ that maximize the per-antenna...
Source: http://arxiv.org/abs/1304.5850v1
USFS instructor Winston Rall, R6 Health and Safety Specialist marks a hazard tree on an overhanging bank. Hazard tree/danger tree training course. Olympic National Forest, Washington. For more see Field Guide for Hazard-Tree Identification and Mitigation on Developed Sites in Oregon and Washington Forests (2014) here: www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprd3799993.pdf Photo by: Kristen Chadwick Date: June 6, 2013 Photo credit: USDA Forest Service, Region 6, State and Private Forestry,...
Topics: training, usda, stateandprivateforestry, sawyer, r6, foresthealth, region6, kristenchadwick,...
Cathedral Rocks, Oak Creek Canyon. 7th Western Hazard Tree Workshop field trip. Sedona, Arizona. "Lunch and Field Trip to Local Riparian Zones. Developed sites in riparian areas along Oak Creek. Hazard Tree Case Studies. Field trip lead by Mary Lou Fairweather and Ed Eckley, with technical tool demonstrations by Frank Rinn." For the complete workshop agenda see: www.fs.fed.us/foresthealth/technology/htwc/2013/agenda.htm Photo by: Kristen Chadwick Date: May 14, 2013 Photo credit: USDA...
Topics: r6, usda, stateandprivateforestry, region6, forestpathologist, kristenchadwick, 2013, usfs,...
Forest entomologist Andy Eglitis. Central Oregon Forest Insect and Disease Service Center. Photo by: Kristen Chadwick Date: July 9, 2013 Photo credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection, Westside Forest Insect and Disease Service Center. Source: Kristen Chadwick collection; Sandy, Oregon. Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth
Topics: foresthealthprotection, pacificnorthwestregion, usda, stateandprivateforestry,...
Oregon Department of Forestry aerial observer and forest pathologist Mike McWilliams with the ODF Partenavia. Roseburg Regional Airport, Oregon. Photo by: Unknown Date: June 28, 2013 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Aerial Survey Program collection. For more about the Swiss needle cast program, see: sncc.forestry.oregonstate.edu/survey-maps Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest...
Topics: r6, usda, stateandprivateforestry, partenavia, foresthealth, region6, forestpathologist,...
Lunch stop on the field trip. 7th Western Hazard Tree Workshop. Sedona, Arizona. "Field trip to higher elevation areas toward Flagstaff. Bring your hard hat and appropriate field gear! Tentative Agenda: 1) Deicing salt-caused mortality = hazard tree development along highways/roadways; 2) Travel management rule and hazard tree liability; 3) Why you don't want to live in an aspen grove; and 4) Ski areas and hazard tree issues." For the complete workshop agenda see:...
Topics: r6, usda, stateandprivateforestry, region6, forestpathologist, kristenchadwick, 2013, usfs,...
Oregon Department of Forestry aerial observers Mike McWilliams (left) and Rob Flowers. Swiss Needle Cast Survey. Photo by: Rob Flowers Date: May 3, 2013 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Aerial Survey Program collection. For more about the Swiss needle cast program, see: sncc.forestry.oregonstate.edu/survey-maps Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection:...
Topics: r6, usda, stateandprivateforestry, foresthealth, may32013, region6, fhp, aerialdetectionsurvey,...
Ellen Goheen presents Doug Daoust with gifts from the Southwest Oregon Service Center. Forest Health Protection tech meeting, Portland, Oregon. Photo by: Unknown Date: November 2013 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Forest Health Protection; Regional Office digital file collection. Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth
Topics: dougdaoust, foresthealthprotection, usda, stateandprivateforestry, ellenmichaelsgoheen, meeting,...
Lunch stop on the field trip. 7th Western Hazard Tree Workshop. Sedona, Arizona. "Field trip to higher elevation areas toward Flagstaff. Bring your hard hat and appropriate field gear! Tentative Agenda: 1) Deicing salt-caused mortality = hazard tree development along highways/roadways; 2) Travel management rule and hazard tree liability; 3) Why you don't want to live in an aspen grove; and 4) Ski areas and hazard tree issues." For the complete workshop agenda see:...
Topics: r6, usda, stateandprivateforestry, region6, forestpathologist, kristenchadwick, 2013, usfs,...
Arxiv.org
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Supermassive black holes (BH) at the centres of galaxies can rapidly change their mass and spin by gas accretion and mergers. Using hydrodynamical cosmological simulations, with prescriptions for BH growth and feedback from Active Galactic Nuclei, we study the evolution of BH spins and we highlight the mechanisms responsible for driving the amplitude and the direction of spins as a function of cosmic time. We find that in the high-redshift universe, galaxies maintain large values of gas...
Source: http://arxiv.org/abs/1304.4583v1
Arxiv.org
by Rebecca G. Martin; Stephen H. Lubow
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Discs that contain dead zones are subject to the Gravo-Magneto (GM) instability that arises when the turbulence shifts from gravitational to magnetic. We have previously described this instability through a local analysis at some radius in the disc in terms of a limit cycle. A disc may be locally unstable over a radial interval. In this paper, we consider how the local instability model can describe global disc outbursts. The outburst is triggered near the middle of the range of locally...
Source: http://arxiv.org/abs/1304.4647v1
Arxiv.org
by Marco Koschorreck; Daniel Pertot; Enrico Vogt; Michael Köhl
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Harnessing spins as carriers for information has emerged as an elegant extension to the transport of electrical charges. The coherence of such spin transport in spintronic circuits is determined by the lifetime of spin excitations and by spin diffusion. Fermionic quantum gases are a unique system to study the fundamentals of spin transport from first principles since interactions can be precisely tailored and the dynamics is on time scales which are directly observable. In particular at...
Source: http://arxiv.org/abs/1304.4980v1
Arxiv.org
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In this paper, we prove that for fixed $k\geq 1$, the Wilker type inequality {equation*} \frac{2}{k+2}(\frac{\sin x}{x}) ^{kp}+\frac{k}{k+2}(\frac{% \tan x}{x})^{p}>1 {equation*}% holds for $x\in (0,\pi /2) $ if and only if $p>0$ or $p\leq -% \frac{\ln (k+2) -\ln 2}{k(\ln \pi -\ln 2)}$. It is reversed if and only if $-\frac{12}{5(k+2)}\leq p 0$ or $p\leq -\frac{12}{5(k+2)}$. And, for fixed $k
Source: http://arxiv.org/abs/1304.5392v1
Arxiv.org
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When solving renormalisation group equations in a quantum field theory, one often specifies the boundary conditions at multiple renormalisation scales, such as the weak and grand-unified scales in a theory beyond the standard model. A point in the parameter space of such a model is usually specified by the values of couplings at these boundaries of the renormalisation group flow, but there is no theorem guaranteeing that such a point has a unique solution to the associated differential...
Source: http://arxiv.org/abs/1304.5462v1
Arxiv.org
by Giacomo Vianello
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The Fermi observatory, with its Gamma-Ray Bursts monitor (GBM) and Large Area Telescope (LAT), is observing Gamma-ray Bursts with unprecedented spectral coverage and sensitivity, from ~10 keV to > 300 GeV. In the first 3 years of the mission it observed emission above 100 MeV from 35 GRBs, an order of magnitude gain with respect to previous observations in this energy range. In this paper we review the main results obtained on such sample, highlighting also the relationships with the...
Source: http://arxiv.org/abs/1304.5570v3
Arxiv.org
by Ulugbek Yakhshiev; Hyun-Chul Kim
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We investigated the transverse charge densities in the nucleon in nuclear matter within the framework of the in-medium modified Skyrme model. The medium modification of the nucleon electromagnetic form factors are first discussed. The results show that the form factors in nuclear matter fall off faster than those in free space, as the momentum transfer increases. As a result, the charge radii of the nucleon become larger, as the nuclear matter density increases. The transverse charge densities...
Source: http://arxiv.org/abs/1304.5926v1
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We investigate the modification of gas phase ion polarizabilities upon solvation in polar solvents and ionic liquids. To this aim, we develop a classical electrostatic theory of charged liquids composed of solvent molecules modeled as finite size dipoles, and embedding polarizable ions that consist of Drude oscillators. In qualitative agreement with ab-initio calculations of polar solvents and ionic liquids, the hydration energy of a polarizable ion in both type of dielectric liquid is shown to...
Source: http://arxiv.org/abs/1304.6378v1
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We analyze geometrical scaling (GS) in Deep Inelstic Scattering at HERA and in pp collisions at the LHC energies and in NA61/SHINE experiment. We argue that GS is working up to relatively large Bjorken $x \sim 0.1$. This allows to study GS in negative pion multiplicity $p_{\rm T}$ distributions at NA61/SHINE energies where clear sign of scaling violations is seen with growing rapidity when one of the colliding partons has Bjorekn $x \ge 0.1$.
Source: http://arxiv.org/abs/1304.1867v1
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The left-right twin Higgs model contains a new vector-like heavy top quark, which mixes with the SM-like top quark. In this work, we studied the single vector-like top partner production via process $e^{-}\gamma \rightarrow \nu_{e}\bar{T}b$ at the International Linear Collider. We calculated the production cross section at tree level and displayed the relevant differential distributions. The result shows that there will be 125 events produced each year with $\sqrt{s}$=2TeV and the integrated...
Source: http://arxiv.org/abs/1304.2249v1
Arxiv.org
by Ali Messaoudi; Olivier Sester; Glauco Valle
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Consider the basic algorithm to perform the transformation n--> n+1 changing digits of the d-adic expansion of n one by one. We obtain a family of Markov chains on the non-negative integers through sucessive and independent applications of the algorithm modified by a parametrized stochastic rule that randomly prevents one of the steps in the algorithm to finish. The objects of study in this paper are the spectra of the transition operators of these Markov chains. The spectra of these Markov...
Source: http://arxiv.org/abs/1304.2874v1
Arxiv.org
by Sarah Folkerts; Cristiano Germani; Javier Redondo
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Constraints on inflationary scenarios and isocurvature perturbations have excluded the simplest and most generic models of dark matter based on QCD axions. Considering non-minimal kinetic couplings of scalar fields to gravity substantially changes this picture. The axion can account for the observed dark matter density in the anthropic window avoiding an overproduction of isocurvature fluctuations. Finally, we show that assuming the same non-minimal kinetic coupling to the axion (dark matter)...
Source: http://arxiv.org/abs/1304.7270v1
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Motivated by a recent experimental observation of a nodal liquid on both single crystals and thin films of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ by Chatterjee \emph{et al.} [Nature Physics \textbf{6}, 99 (2010)], we perform a field-theoretical renormalization group (RG) analysis of a two-dimensional model consisting of eight points located near the "hot spots" on the Fermi surface which are directly connected by spin density wave ordering wave vector. We derive RG equations up to...
Source: http://arxiv.org/abs/1304.6384v2
Arxiv.org
by Edouard J. Bernard; Matteo Monelli; Carme Gallart; Giuliana Fiorentino; Santi Cassisi; Antonio Aparicio; Andrew A. Cole; Igor Drozdovsky; Sebastian L. Hidalgo; Evan D. Skillman; Peter B. Stetson; Eline Tolstoy
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We present the results of a new search for variable stars in the Local Group dwarf galaxy Leo A, based on deep photometry from the Advanced Camera for Surveys onboard the Hubble Space Telescope. We detected 166 bona fide variables in our field, of which about 60 percent are new discoveries, and 33 candidate variables. Of the confirmed variables, we found 156 Cepheids, but only 10 RR Lyrae stars despite nearly 100 percent completeness at the magnitude of the horizontal branch. The RR Lyrae stars...
Source: http://arxiv.org/abs/1304.5435v1
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Partial wave expansion of the Coulomb-distorted plane wave is determined and studied. Dominant and sub-dominant asymptotic expansion terms are given and leading order three-dimensional asymptotic form is derived. The generalized hypergeometric function $_2F_2(a,a;a+l+1,a-l;z)$ is expressed with the help of confluent hypergeometric functions and the asymptotic expansion of $_2F_2(a,a;a+l+1,a-l;z)$ is simplified.
Source: http://arxiv.org/abs/1304.6247v1
On Robertson in front of the Candlelight Lounge, neighbors second lining Source: https://www.youtube.com/watch?v=0qrcjwfix1o Uploader: BigRedCotton Upload date: 20130508
Topics: Youtube, video, Music, Treme, Tuba Fats, Candlelight Lounge, New Orleans, New Breed Brass Band,...
Arxiv.org
by Taewan Noh; Manuel Houzet; Julia S. Meyer; Venkat Chandrasekhar
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Nonlocal charge correlations induced in two normal metals contacted separately to a supercon- ductor have been studied intensively in the past few years. Here we investigate nonlocal correlations induced by the transfer of pure spin currents through a superconductor on a scale comparable to the superconducting coherence length. As with charge currents, two processes contribute to the nonlocal spin signal: crossed Andreev reflection (CAR), where an electron with spin up injected from one normal...
Source: http://arxiv.org/abs/1304.0669v1
Arxiv.org
by Rakesh S. Singh; Biman Bagchi
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Solid-solid collapse transition in open framework structures is ubiquitous in nature. The real difficulty in understanding detailed microscopic aspects of such transitions in molecular systems arises from the interplay between different energy and length scales involved in molecular systems, often mediated through a solvent. In this work we employ Monte Carlo (MC) simulations to study the collapse transition in a model molecular system interacting via both isotropic as well as anisotropic...
Source: http://arxiv.org/abs/1304.3232v1
Arxiv.org
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The mean color of globular clusters (GCs) in early-type galaxies is in general bluer than the integrated color of halo field stars in host galaxies. Metal-rich GCs often appear more associated with field stars than metal-poor GCs, yet show bluer colors than their host galaxy light. Motivated by the discovery of multiple stellar populations in Milky Way GCs, we present a new scenario in which the presence of second-generation (SG) stars in GCs is responsible for the color discrepancy between...
Source: http://arxiv.org/abs/1304.5791v1
Arxiv.org
by Markus Bader; Johann Prankl; Markus Vincze
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Humanoid robots without internal sensors such as a compass tend to lose their orientation after a fall. Furthermore, re-initialisation is often ambiguous due to symmetric man-made environments. The room-awareness module proposed here is inspired by the results of psychological experiments and improves existing self-localization strategies by mapping and matching the visual background with colour histograms. The matching algorithm uses a particle-filter to generate hypotheses of the viewing...
Source: http://arxiv.org/abs/1304.5878v1
Ivan Montano
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Ivan feeds his horse, waters his plants, and goes to the soccer field to watch his nephew's training. This is part of a 24-hour recording of a day in the life of Ivan Montaño, a horse-cart driver and tailor from Cali, Colombia. This video was produced by Claudia Quigua, Diego Eraso, Carlos A. Sanchez, Nelson Gomez, Carlos H Tofiño, Daniel F. Gomez, and Harvey Paz. This video is part of the Global Lives Project, a video library of life experience. For more information please visit...
Topics: Cali, Colombia, family, house, wife, bedroom, sleeping, horse cart driver, lives in transit,...
Mingmar Lama
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Mingmar washes and styles his hair, packs his day bag, meets his friend, Namgyal, and cousin, Delek, and heads to the mountains to find catepillar fungus. He takes a break after walking up the hill. This is part of a 24-hour recording of a day in the life of Mingmar Lama. This video was produced by Rinzin Lama, Andrew Mahlstedt, Dawa Yakpa, Yog Shakya, Tenzin Norbu, Ravi Shrestha, Karma Ghale, Santa Bahadur Tamang, Arjun Magar, Tenzin Norbu, Thepe Tamang, Maila Tamang, Santosh, Jit Bahadur...
Topics: Gorkha, Tsum Valley, Nepali, Tibetan, Tsum, wash hair, pack day bag, friend, hike,...
Pierre Vallee
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Night. Guiding the cargo ship on the St. Lawrence River from the navigation bridge. Giving instructions to helmsman. Talking with cameraman about how he got through boat pilot formation. This is part of a 24-hour recording of a day in the life of Pierre Vallee, a boat pilot living in Trois Rivières in the province of Quebec, Canada. This video was produced by Karen Vanderborght, Catherine Genest, Rébecca Lavoie, Ariane Lorrain, Marianne Ploska, Patrick Pearce, and Yanie Dupont-Hébert. This...
Topics: navigation bridge, guiding, cargo ship, helsman, night, boat pilot formation, Trois Rivieres,...
Arxiv.org
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Computational modeling and simulation are presented on the motion of red blood cells behind a moving interface in a capillary. The methodology is based on an immersed boundary method and the skeleton structure of the red blood cell (RBC) membrane is modeled as a spring network. The computational domain is moving with either a designated RBC or an interface in an infinitely long two-dimensional channel with an undisturbed flow field in front of the domain. The tanking-treading and the...
Source: http://arxiv.org/abs/1304.3828v1
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by Thomas Brihaye; Quentin Menet
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In 2006, Varacca and V\"olzer proved that on finite graphs, omega-regular large sets coincide with omega-regular sets of probability 1, by using the existence of positional strategies in the related Banach-Mazur games. Motivated by this result, we try to understand relations between sets of probability 1 and various notions of simple strategies (including those introduced in a recent paper of Gr\"adel and Lessenich). Then, we introduce a generalisation of the classical Banach-Mazur...
Source: http://arxiv.org/abs/1304.5438v2
Arxiv.org
by Marcel Jackson; Tomasz Kowalski; Todd Niven
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The role of polymorphisms in determining the complexity of constraint satisfaction problems is well established. In this context we study the stability of CSP complexity and polymorphism properties under some basic graph theoretic constructions. As applications we prove the algebraic CSP dichotomy conjecture holds for digraphs whose symmetric closure is a complete graph, and observe a collapse in the applicability of algorithms for CSPs over directed graphs with both a total source and a total...
Source: http://arxiv.org/abs/1304.4986v1
Deb Cotton Secondline Collection
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Source: https://www.youtube.com/watch?v=r_sdNx2FN4U Uploader: BigRedCotton Upload date: 20130304
Topics: Youtube, video, Music, Second line, brass band, parade, New Orleans, jazz, brass music, live music...
Ruixian Fan
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Ruixian Fan has a nap on the Baoji to Xi'an commuter train. She and her collegues must get some sleep before they begin their overnight shift on the K165 to Kunming later in the evening.
Topics: Baoji, Xi'an, commuter, colleagues, Kunming, overnight shift, globallivesproject, Global Lives...
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Arxiv.org
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The paper briefly describes a basic set of special combinatorial engineering frameworks for solving complex problems in the field of hierarchical modular systems. The frameworks consist of combinatorial problems (and corresponding models), which are interconnected/linked (e.g., by preference relation). Mainly, hierarchical morphological system model is used. The list of basic standard combinatorial engineering (technological) frameworks is the following: (1) design of system hierarchical model,...
Source: http://arxiv.org/abs/1304.0030v1
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In this work, the linear stability of the viscous incompressible fluid flow between two parallel horizontal porous stationary plates with the assumption that there is a small constant suction at upper plate and a small constant injection at the lower plate is studied.The Navier-Stokes and continuous equations are reduced to an equation modified by the suction Reynolds number, which we call modified Orr-Sommerfeld equation. This equation is rewritten as an eigenvalue problem and is solved...
Source: http://arxiv.org/abs/1304.7210v1
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by Piotr Bozek; Wojciech Broniowski
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We analyze the proton-lead collisions at the LHC energy of 5.02TeV in the three-stage approach, previously used to successfully describe the relativistic A-A collisions. The approach consists of the early phase, modeled with the Glauber model, the event-by-event viscous 3+1 dimensional (3+1 D) relativistic hydrodynamics, and the statistical hadronization at freeze-out. We show that features typical of collective dynamics, such as the harmonic flow and the ridge structures in the two-particle...
Source: http://arxiv.org/abs/1304.3044v1
Arxiv.org
by Taiji Chiba; Michiaki Matsukawa; Junki Tada; Satoru Kobayashi; Makoto Hagiwara; Tsuyoshi Miyazaki; Kazuhiro Sano; Yoshiaki Ono; Takahiko Sasaki; Jun-ichi Echigoya
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We report the magnetotransport and $dc$ magnetic susceptibility of the polycrystalline samples of Pr$_{2}$Ba$_{4}$Cu$_{7}$O$_{15-\delta}$, to examine the effect of magnetic field on the superconducting phase of the metallic CuO double chain. The resistive critical magnetic field is estimated to be about 21 T at low temperatures from the resistive transition data. On the other hand, the corresponding critical field determined from the magnetization measurements gives rise to a very low value of...
Source: http://arxiv.org/abs/1304.1610v2
Arxiv.org
by S. I. Dejak; D. Egli; P. M. Lushnikov; I. M. Sigal
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We investigate the (reduced) Keller-Segel equations modeling chemotaxis of bio-organisms. We present a formal derivation and partial rigorous results of the blowup dynamics of solution of these equations describing the chemotactic aggregation of the organisms. Our results are confirmed by numerical simulations and the formula we derive coincides with the formula of Herrero and Vel\'{a}zquez for specially constructed solutions.
Source: http://arxiv.org/abs/1304.1583v1
Arxiv.org
by Tomohiro I; Wataru Matsubara; Kouji Shimohira; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda; Kazuyuki Narisawa; Ayumi Shinohara
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We solve the problems of detecting and counting various forms of regularities in a string represented as a Straight Line Program (SLP). Given an SLP of size $n$ that represents a string $s$ of length $N$, our algorithm compute all runs and squares in $s$ in $O(n^3h)$ time and $O(n^2)$ space, where $h$ is the height of the derivation tree of the SLP. We also show an algorithm to compute all gapped-palindromes in $O(n^3h + gnh\log N)$ time and $O(n^2)$ space, where $g$ is the length of the gap....
Source: http://arxiv.org/abs/1304.7067v1
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by Daisuke A. Takahashi
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An integrable model possessing inhomogeneous ground states is proposed. The model is a higher-order analog of the nonlinear Schr\"odinger equation. The inverse scattering theory with the elliptic-functional background is formulated, and the N-soliton solution is obtained as a particular solution. We provide the exact bosonic and fermionic quasiparticle eigenstates and reveal various kinds of dynamics such as dark soliton billiards, dislocations, gray solitons, and envelope solitons.
Source: http://arxiv.org/abs/1304.7567v1
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by Yun Wei; Chuanyi Ji; Floyd Galvan; Stephen Couvillon; George Orellana; James Momoh
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Smart energy grid is an emerging area for new applications of machine learning in a non-stationary environment. Such a non-stationary environment emerges when large-scale failures occur at power distribution networks due to external disturbances such as hurricanes and severe storms. Power distribution networks lie at the edge of the grid, and are especially vulnerable to external disruptions. Quantifiable approaches are lacking and needed to learn non-stationary behaviors of large-scale failure...
Source: http://arxiv.org/abs/1304.7710v1
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We study the matroid secretary problems with submodular valuation functions. In these problems, the elements arrive in random order. When one element arrives, we have to make an immediate and irrevocable decision on whether to accept it or not. The set of accepted elements must form an {\em independent set} in a predefined matroid. Our objective is to maximize the value of the accepted elements. In this paper, we focus on the case that the valuation function is a non-negative and monotonically...
Source: http://arxiv.org/abs/1107.2188v3
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by Franz-Viktor Kuhlmann; Katarzyna Kuhlmann
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We study spaces $M(R(y))$ of $\R$-places of rational function fields $R(y)$ in one variable. For extensions $F|R$ of formally real fields, with $R$ real closed and satisfying a natural condition, we find embeddings of $M(R(y))$ in $M(F(y))$ and prove uniqueness results. Further, we study embeddings of products of spaces of the form $M(F(y))$ in spaces of $\R$-places of rational function fields in several variables. Our results uncover rather unexpected obstacles to a positive solution of the...
Source: http://arxiv.org/abs/1304.0201v1
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by Orestis Georgiou; Carl P. Dettmann; Justin Coon
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Network connectivity is usually addressed for convex domains where a direct line of sight exists between any two transmitting/receiving nodes. Here, we develop a general theory for the network connectivity properties across a small opening, rendering the domain essentially non-convex. Our analytic approach can go only so far as we encounter what is referred to in statistical physics as quenched disorder making the problem non-trivial. We confirm our theory through computer simulations, obtain...
Source: http://arxiv.org/abs/1304.3646v1
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by Jens Hornbostel; Stefan Schroeer
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Expanding a result of Serre on finite CW-complexes, we show that the Brauer group coincides with the cohomological Brauer group for arbitrary compact spaces. Using results from the homotopy theory of classifying spaces for Lie groups, we give another proof of the result of Antieau and Williams that equality does not hold for Eilenberg--MacLane spaces of type K(Z/nZ,2). Employing a result of Dwyer and Zabrodsky, we show the same for the classifying spaces BG where G is an infinite-dimensional...
Source: http://arxiv.org/abs/1304.3986v2
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Multipartite entanglement of large numbers of physically distinct linear resonators is of both fundamental and applied interest, but there have been no feasible proposals to date for achieving it. At the same time, the Bose-Hubbard model with attractive interactions (ABH) is theoretically known to have a phase transition from the superfluid phase to a highly entangled nonlocal superposition, but observation of this phase transition has remained out of experimental reach. In this theoretical...
Source: http://arxiv.org/abs/1304.4065v3
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by Chun Lam Chan; Sheng Cai; Mayank Bakshi; Sidharth Jaggi; Venkatesh Saligrama
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We formulate and analyze a stochastic threshold group testing problem motivated by biological applications. Here a set of $n$ items contains a subset of $d \ll n$ defective items. Subsets (pools) of the $n$ items are tested -- the test outcomes are negative, positive, or stochastic (negative or positive with certain probabilities that might depend on the number of defectives being tested in the pool), depending on whether the number of defective items in the pool being tested are fewer than the...
Source: http://arxiv.org/abs/1304.6027v3
Arxiv.org
by R. Cid Fernandes; E. Perez; R. Garcia Benito; R. M. Gonzalez Delgado; A. L. de Amorim; S. F. Sanchez; B. Husemann; J. Falcon Barroso; P. Sanchez-Blazquez; C. J. Walcher; D. Mast
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Fossil record methods based on spectral synthesis techniques have matured over the past decade, and their application to integrated galaxy spectra fostered substantial advances on the understanding of galaxies and their evolution. Yet, because of the lack of spatial resolution, these studies are limited to a global view, providing no information about the internal physics of galaxies. Motivated by the CALIFA survey, which is gathering Integral Field Spectroscopy over the full optical extent of...
Source: http://arxiv.org/abs/1304.5788v1
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by Nobuchika Okada; Toshifumi Yamada
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We consider a simple extension of the Standard Model (SM) that incorporates a Majorana fermion dark matter and a charged scalar particle with a coupling to the SM leptons through renormalizable terms. Another renormalizable term involving the charged scalar and the Higgs boson gives rise to interactions between the dark matter and SM quarks at the one-loop level, which induce the elastic scatterings between dark matter and nucleus. The same term also affects the effective coupling of the Higgs...
Source: http://arxiv.org/abs/1304.2962v1
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I discuss the sensitivity of future medium baseline reactor antineutrino experiments on the neutrino mass hierarchy. By using the standard chi^2 analysis, we find that the sensitivity depends strongly on the baseline length L and the energy resolution (delta E/E)^2 = (a/ E/MeV)^2 + b^2, where a and b parameterize the statistical and systematic uncertainties, respectively. The optimal length is found to be L ~ 40-55 km, the larger resolution the shorter optimal L. For a 5 kton detector (with 12%...
Source: http://arxiv.org/abs/1304.5306v2
Ruixian Fan
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Ruixian Fan and our director, Guo Qinhua, exchange a few words. Our on-screen participant is tired after and long night on duty. She sits in the onboard train office. The K165 from Xi'an to Kunming has been delayed several hours due to heavy rain and mudslides on the tracks. Before the next stop Ruixian Fan locks the bathroom doors. The train is moving very slowly. The train staff walk quickly through the carriages.
Topics: onboard train office, rain, mudslides, train staff, globallivesproject, Global Lives Project, glp,...
Ruixian Fan
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Ruixian Fan makes sure that each passenger is in their proper hard or soft sleeper bunk. She greets them and also helps everyone get settled on the train. This includes providing hot water for drinking and answering questions about when the K165 is expected to arrive in Kunming. Ruixian Fan sits down in her onboard train office and fills in a work report.
Topics: passenger, bunk, Kunming, work report, globallivesproject, Global Lives Project, glp, globallives
Region 5 aerial observers Bob Noyes (left) and Zack Heath at the Charles M. Schultz-Sonoma County Airport, California. Photo by: Lisa K. Bell, University of California Cooperative Extension, Sonoma County. Date: c.2013 Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth
Topics: r5, bobnoyes, foresthealthprotection, usda, Aerial Detection Surveys, stateandprivateforestry,...
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With Hot 8 Brass Band playing 'Fresh and Clean' by Outcast Source: https://www.youtube.com/watch?v=z0PX-WLJIsU Uploader: BigRedCotton Upload date: 20130421
Topics: Youtube, video, Music, Second line, brass band, parade, New Orleans, jazz, brass music, live music...
Pathology field trip to Oak Creek Canyon riparian area. 7th Western Hazard Tree Workshop field trip. Sedona, Arizona. "Lunch and Field Trip to Local Riparian Zones. Developed sites in riparian areas along Oak Creek. Hazard Tree Case Studies. Field trip lead by Mary Lou Fairweather and Ed Eckley, with technical tool demonstrations by Frank Rinn." For the complete workshop agenda see: www.fs.fed.us/foresthealth/technology/htwc/2013/agenda.htm Photo by: Kristen Chadwick Date: May 14,...
Topics: r6, usda, stateandprivateforestry, region6, forestpathologist, kristenchadwick, 2013, usfs,...
Arxiv.org
by Mogens R. Samuelsen; Avinash Khare; Avadh Saxena; Kim Ø. Rasmussen
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We study the statistical mechanics of the one-dimensional discrete nonlinear Schr\"odinger (DNLS) equation with saturable nonlinearity. Our study represents an extension of earlier work [Phys. Rev. Lett. {\bf 84}, 3740 (2000)] regarding the statistical mechanics of the one-dimensional DNLS equation with a cubic nonlinearity. As in this earlier study we identify the spontaneous creation of localized excitations with a discontinuity in the partition function. The fact that this phenomenon is...
Source: http://arxiv.org/abs/1304.2065v1
Clearing a safely-felled danger tree from the road. Roadside danger tree removal sawyer safety demonstration. Danger tree/hazard tree training course. Olympic National Forest, Washington. For more see Field Guide for Hazard-Tree Identification and Mitigation on Developed Sites in Oregon and Washington Forests (2014) here: www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprd3799993.pdf Photo by: Kristen Chadwick Date: June 6, 2013 Photo credit: USDA Forest Service, Region 6, State and Private...
Topics: training, usda, stateandprivateforestry, wenatcheeservicecenter, r6, foresthealth, region6,...
Arxiv.org
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We consider generic nonextremal stationary dirty black holes. It is shown that in the vicinity of any bifurcation surface the energy of collision of two particles in the centre of mass frame can grow unbound. This is a generic property that, in particular, includes collisions near the inner black hole horizon analyzed earlier by different methods. The similar results are also valid for cosmological horizons. The case of the de Sitter metric is discussed.
Source: http://arxiv.org/abs/1203.5291v3
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We consider fast magnetic reconnection that takes place within turbulent magnetic flux and show that the process results in diffusion of magnetic fields and matter, which we term reconnection diffusion. The process of reconnection diffusion is based on the model of 3D reconnection of weakly turbulent magnetic fields and is applicable to both fully ionized and partially ionized gas. The rate of reconnection diffusion does not depend on the level of ionization and therefore the usually employed...
Source: http://arxiv.org/abs/1304.3133v1
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We study support tau-tilting modules over preprojective algebras of Dynkin type. We give a complete description of all support tau-tilting modules. Moreover we show that they are in bijection with elements of Weyl groups, the set of torsion classes, the set of torsion-free classes and many other important objects in representation theory. We also study g-matrices of support tau-tilting modules. We give an explicit description of g-matrices and prove that cones given by g-matrices coincide with...
Source: http://arxiv.org/abs/1304.0667v2
Arxiv.org
by Jochen Schieck for the DEPFET Collaboration
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Currently the heavy flavour factory KEKB located at the KEK accelerator centre in Tsukuba, Japan, is being upgraded to the Super KEKB factory, aiming for a substantially higher luminosity of 8x10^35 cm^-2 s^-1. This by a factor of 40 increased luminosity requires significant modifications of the Belle detector. The vertex detector needs to be redesigned and, besides a four-layer silicon strip detector, a pixel detector based on the DEPFET technology will be installed closest to the interaction...
Source: http://arxiv.org/abs/1304.0870v1
Arxiv.org
by L. De Angelis; R. Marotta; F. Pezzella; R. Troise
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In the framework of Type IIB String Theory compactified on a general six-torus T6 with arbitrary complex structure, Yukawa couplings are determined for the chiral matter described by open strings ending on D9-branes having different oblique magnetization.
Source: http://arxiv.org/abs/1304.0978v1
Arxiv.org
by Gábor Kovács; S. Hodgkin; B. Sipőcz; D. Pinfield; D. Barrado; J. Birkby; M. Cappetta; P. Cruz; J. Koppenhoefer; E. Martín; F. Murgas; B. Nefs; R. Saglia; J. Zendejas
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The WFCAM Transit Survey (WTS) is a near-infrared transit survey running on the United Kingdom Infrared Telescope (UKIRT), designed to discover planets around M dwarfs. The WTS acts as a poor-seeing backup programme for the telescope, and represents the first dedicated wide-field near-infrared transit survey. In this paper we describe the observing strategy of the WTS and the processing of the data to generate lightcurves. We describe the basic properties of our photometric data, and measure...
Source: http://arxiv.org/abs/1304.1399v1
Arxiv.org
by Ka-Ho Lo; M. Coleman Miller; Sudip Bhattacharyya; Frederick K. Lamb
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Simultaneous, precise measurements of the mass $M$ and radius $R$ of neutron stars can yield uniquely valuable information about the still uncertain properties of cold matter at several times the density of nuclear matter. One method that could be used to measure $M$ and $R$ is to analyze the energy-dependent waveforms of the X-ray flux oscillations seen during some thermonuclear bursts from some neutron stars. These oscillations are thought to be produced by X-ray emission from hotter regions...
Source: http://arxiv.org/abs/1304.2330v1
Arxiv.org
by Marco Bonvini; Fabrizio Caola; Stefano Forte; Kirill Melnikov; Giovanni Ridolfi
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We study the effect of QCD corrections to the $gg\to H\to W^+ W^-$ signal-background interference at the LHC for a heavy Higgs boson. We construct a soft-collinear approximation to the NLO and NNLO corrections for the background process, which is exactly known only at LO. We estimate its accuracy by constructing and comparing the same approximation to the exact result for the signal process, which is known up to NNLO, and we conclude that we can describe the signal-background interference to...
Source: http://arxiv.org/abs/1304.3053v1
Arxiv.org
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Future linear colliders designs, ILC and CLIC, are expected to be powerful machines for the discovery of Physics Beyond the Standard Model and subsequent precision studies. However, due to the intense beams (high luminosity, high energy), strong electromagnetic fields occur in the beam-beam interaction region. In the context of precision high energy physics, the presence of such strong fields may yield sensitive corrections to the observed electron-positron processes. The Furry picture of...
Source: http://arxiv.org/abs/1304.4241v1
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by Tomasz Sowiński; Ravindra W. Chhajlany; Omjyoti Dutta; Luca Tagliacozzo; Maciej Lewenstein
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We study the attractive Bose-Hubbard model with a tunable, on-site three-body constraint. It is shown that the critical behavior of the system undergoing a phase transition from pair-superfluid to superfluid at integer filling depends on the value of the three-body repulsion. In particular, a critical exponent and the central charge governing the quantum phase transitions are shown to have repulsion dependent features. In consequence, the model extends the list of known systems violating the...
Source: http://arxiv.org/abs/1304.4835v1
Arxiv.org
by Hiroshi Kobayashi; Nicolas Dauphas
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Mars is likely to be a planetary embryo formed through collisions with planetesimals, which can explain its small mass and rapid formation timescale obtained from 182Hf-182$W chronometry. In the classical theory of planet formation, the final embryo mass is determined only by the solid surface density. However, embryos can stir surrounding planetesimals, leading to fragmentation through erosive (cratering) collisions. We find that radial drift of small fragments can drastically reduce the solid...
Source: http://arxiv.org/abs/1304.5017v1