Skip to main content

7,363
UPLOADS


More right-solid

More right-solid

Show sorted alphabetically

More right-solid

Show sorted alphabetically

More right-solid

More right-solid
SHOW DETAILS
up-solid down-solid
eye
Title
Date Reviewed
Creator
American Libraries
Oct 13, 2017 Ekhtiar, Maryam D. and Claire Moore, ed.
texts

eye 786

favorite 7

comment 1

( 1 reviews )
Internet Archive Presents
May 20, 2014 Rick Prelinger
movies

eye 1,839

favorite 1

comment 1

Lost Landscapes of San Francisco 6 (2011) is the latest in a series of historical urban explorations, made from home movies, industrial and promotional films and outtakes, and other cinematic ephemera. It sold out the Castro Theatre in December, and this will be its second screening. YOU are the soundtrack. Please come prepared to shout out your identifications, ask questions about what’s on the screen, and share your thoughts with fellow audience members. Most of the footage in this program...
favoritefavoritefavoritefavoritefavorite ( 1 reviews )
Topics: Rick Prelinger, San Francisco, Internet Archive, Brewster Kahle, Archival movies
Mycelial fans of Armillaria ostoyae, cause of Armillaria root disease, under the bark of a dying sugar pine. Photo by: Ellen Michaels Goheen or Donald J. Goheen Date: c.2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection, Southwest Oregon Forest Insect and Disease Service Center Source: Goheen, E.M. and Goheen, D.J., 2014. Status of sugar and western white pines on federal forest lands in southwest Oregon: Inventory query and natural stand survey...
Topics: usda, stateandprivateforestry, treedamage, foresthealth, donaldjgoheen, forestdamage,...
TBC playing 'Shallow Water' Source: https://www.youtube.com/watch?v=kYItYLN0x0k Uploader: BigRedCotton Upload date: 20121212
Topics: Youtube, video, Music, Second line, brass band, parade, New Orleans, jazz, brass music, live music...
Arxiv.org
texts

eye 39

favorite 0

comment 0

We investigate femtoscopic $\pi \pi$ correlations using the UrQMD approach combined with a correlation afterburner. The dependence of $\pi \pi$ correlations on the charged particle multiplicity and formation time in p+p collisions at $\sqrt{s_{NN}}$= 7 TeV is explored and compared to present ALICE data. The data allows to constrain the formation time in the string fragmentation to $\tau_f \leq 0.8$ fm/c.
Source: http://arxiv.org/abs/1203.4421v1
Arxiv.org
texts

eye 77

favorite 0

comment 0

The concepts of infinity and infinitesimal in mathematics date back to anciens Greek and have always attracted great attention. Very recently, a new methodology has been proposed by Sergeyev for performing calculations with infinite and infinitesimal quantities, by introducing an infinite unit of measure expressed by the numeral grossone. An important characteristic of this novel approach is its attention to numerical aspects. In this paper we will present some possible applications and use of...
Source: http://arxiv.org/abs/1107.5681v2
Arxiv.org
texts

eye 61

favorite 0

comment 0

Galaxy groups are the least massive systems where the bulk of baryons begin to be accounted for. Not simply the scaled-down versions of rich clusters following self-similar relations, galaxy groups are ideal systems to study baryon physics, which is important for both cluster cosmology and galaxy formation. We review the recent observational results on the hot gas in galaxy groups. The first part of the paper is on the scaling relations, including X-ray luminosity, entropy, gas fraction, baryon...
Source: http://arxiv.org/abs/1203.4228v1
Arxiv.org
- Kevin Heng; Pushkar Kopparla
texts

eye 94

favorite 0

comment 0

We investigate the stability of super Earth atmospheres around M stars using a 7-parameter, analytical framework. We construct stability diagrams in the parameter space of exoplanetary radius versus semi-major axis and elucidate the regions in which the atmospheres are stable against the condensation of their major constituents, out of the gas phase, on their permanent nightside hemispheres. We find that super Earth atmospheres which are nitrogen-dominated ("Earth-like") occupy a...
Source: http://arxiv.org/abs/1203.1922v3
Sugar pine mortality caused by mountain pine beetles. Siskiyou Mountains, Southwest Oregon. Photo by: Ellen Michaels Goheen or Donald J. Goheen Date: c.2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection, Southwest Oregon Forest Insect and Disease Service Center Source: Goheen, E.M. and Goheen, D.J., 2014. Status of sugar and western white pines on federal forest lands in southwest Oregon: Inventory query and natural stand survey results. Pacific...
Topics: r6, usda, stateandprivateforestry, treedamage, foresthealth, donaldjgoheen, region6, forestdamage,...
Rochelle Desser. Forest Health Protection tech meeting. Region 6 Regional Office. Portland, Oregon. Photo by: Julie Johnson Date: November 7, 2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection. Source: Aerial Survey Program 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: foresthealthprotection, usda, stateandprivateforestry, techmeeting, oregon, usfs, r6, forest...
Consider the following forest-fire process on a connected graph. Each site of the graph can be either occupied or vacant. A vacant site becomes occupied with rate 1. A site is ignited with rate lambda, and its whole occupied cluster burns instantaneously. The purpose of this paper is to show the existence of a stationary distribution for forest-fire processes on Z^d, for d >= 2. We define a distribution as a limit of a sequence of invariant distributions of finite volume forest-fire...
Source: http://arxiv.org/abs/1203.5533v1
Deb Cotton Secondline Collection
- BigRedCotton
movies

eye 26

favorite 0

comment 0

Source: https://www.youtube.com/watch?v=fG62uNfolN0 Uploader: BigRedCotton Upload date: 20120923
Topics: Youtube, video, Entertainment, clip, 2012, 09, 23, 12, 01, 29, debcotton,...
Arxiv.org
texts

eye 51

favorite 0

comment 0

We study the dynamics of an active Brownian particle with a nonlinear friction function located in a spatial cubic potential. For strong but finite damping, the escape rate of the particle over the spatial potential barrier shows a nonmonotonic dependence on the noise intensity. We relate this behavior to the fact that the active particle escapes from a limit cycle rather than from a fixed point and that a certain amount of noise can stabilize the sojourn of the particle on this limit cycle.
Source: http://arxiv.org/abs/1203.6814v1
Arxiv.org
- Inti Sodemann; D. A. Pesin; A. H. MacDonald
texts

eye 110

favorite 0

comment 0

We estimate the strength of interaction-enhanced coherence between two graphene or topological insulator surface-state layers by solving imaginary-axis gap equations in the random phase approximation. Using a self-consistent treatment of dynamic screening of Coulomb interactions in the gapped phase, we show that the excitonic gap can reach values on the order of the Fermi energy at strong interactions. The gap is discontinuous as a function of interlayer separation and effective fine structure...
Source: http://arxiv.org/abs/1203.3594v1
Arxiv.org
texts

eye 34

favorite 0

comment 0

For a field K and directed graph E, we analyze those elements of the Leavitt path algebra L_K(E) which lie in the commutator subspace [L_K(E), L_K(E)]. This analysis allows us to give easily computable necessary and sufficient conditions to determine which Lie algebras of the form [L_K(E), L_K(E)] are simple, when E is row-finite (i.e., has finite out-degree) and L_K(E) is simple.
Source: http://arxiv.org/abs/1107.3114v2
Arxiv.org
- Yang Bai; Hsin-Chia Cheng; Jason Gallicchio; Jiayin Gu
texts

eye 38

favorite 0

comment 0

The main background for the supersymmetric stop direct production search comes from Standard Model ttbar events. For the single-lepton search channel, we introduce a few kinematic variables to further suppress this background by focusing on its dileptonic and semileptonic topologies. All are defined to have end points in the background, but not signal distributions. They can substantially improve the stop signal significance and mass reach when combined with traditional kinematic variables such...
Source: http://arxiv.org/abs/1203.4813v1
Arxiv.org
texts

eye 49

favorite 0

comment 0

We study the Loschmidt echo (LE) in a central spin model in which a central spin is globally coupled to an environment (E) which is subjected to a small and sudden quench at $t=0$ so that its state at $t=0^+$, remains the same as the ground state of the initial environmental Hamiltonian before the quench; this leads to a non-equilibrium situation. This state now evolves with two Hamiltonians, the final Hamiltonian following the quench and its modified version which incorporates an additional...
Source: http://arxiv.org/abs/1203.0737v2
Arxiv.org
- Jan Kolodynski; Jan Chwedenczuk; Wojciech Wasilewski
texts

eye 46

favorite 0

comment 0

A theoretical model describing the Raman scattering process in atomic vapors is constructed. The treatment investigates the low-excitation regime suitable for modern experimental applications. Despite the incorporated decoherence effects (possibly mode dependent) it allows for a direct separation of the time evolution from the spatial degrees of freedom. The impact of noise on the temporal properties of the process is examined. The model is applied in two experimentally relevant situations of...
Source: http://arxiv.org/abs/1203.1402v3
Arxiv.org
texts

eye 119

favorite 0

comment 0

The tent map is an elementary example of an interval map possessing many interesting properties, such as dense periodicity, exactness, Lipschitzness and a kind of length-expansiveness. It is often used in constructions of dynamical systems on the interval/trees/graphs. The purpose of the present paper is to construct, on totally regular continua (i.e. on topologically rectifiable curves), maps sharing some typical properties with the tent map. These maps will be called length-expanding...
Source: http://arxiv.org/abs/1203.2352v1
Arxiv.org
- The ISTRA+ Collaboration; :; V. A. Duk; V. N. Bolotov; A. A. Khudyakov; V. A. Lebedev; A. I. Makarov; V. P. Novikov; A. Yu. Polyarush; S. A. Akimenko; G. I. Britvich; A. P. Filin; A. V. Inyakin; I. Ya. Korolkov; V. M. Leontiev; V. F. Obraztsov; V. A. Polyakov; V. I. Romanovsky; O. G. Tchikilev; V. A. Uvarov; O. P. Yushchenko
texts

eye 93

favorite 0

comment 0

The radiative decay K->mu nu gamma has been studied at ISTRA+ setup in a new kinematical region. About 22K events of K^- -> mu^- nu_mu gamma have been observed. The sign and value of Fv-Fa have been measured for the first time. The result is Fv-Fa=0.21(4)(4).
Source: http://arxiv.org/abs/1005.3517v3
Arxiv.org
- Tetsuo Hyodo; Atsushi Hosaka; Makoto Oka
texts

eye 43

favorite 0

comment 0

Production cross sections of the pentaquark Theta+ baryon in the meson-induced reactions are calculated for JP=1/2+- and 3/2+- cases. Through the comparison with the previous measurements at KEK, several quantum numbers are excluded. The remaining possibilities can be used to cast the upper limit on the Theta+ width, combining with the result from the J-PARC E19 experiment.
Source: http://arxiv.org/abs/1203.0598v2
Arxiv.org
- Seyen Kouwn; Taeyoon Moon; Phillial Oh
texts

eye 91

favorite 0

comment 0

We investigate cosmological consequences of nonlinear sigma model coupled with a cosmological fluid which satisfies the continuity equation. The target space action is of de Sitter type and is composed of four scalar fields. The potential which is a function of only one of the scalar fields is also introduced. We perform a general analysis of the ensuing cosmological equations and give various critical points and their properties. Then, we show that the model exhibits exact cosmological...
Source: http://arxiv.org/abs/1203.6520v3
Arxiv.org
- I. Platais; C. Melo; S. N. Quinn; J. L. Clem; S. E. de Mink; A. Dotter; V. Kozhurina-Platais; D. W. Latham; A. Bellini
texts

eye 61

favorite 0

comment 0

We present a detailed analysis of the upper main sequence of the 1.3 Gyr old open cluster Trumpler 20. High accuracy BV photometry combined with the Very Large Telescope/FLAMES medium-resolution spectroscopy of 954 stars is essential to understanding the unusual appearance of the color-magnitude diagram (CMD), initially suggesting multiple populations in Trumpler 20. We show that differential reddening is a dominant contributor to the apparent splitting/widening of the main-sequence turnoff...
Source: http://arxiv.org/abs/1203.1053v1
Arxiv.org
- Esa Järvenpää; Maarit Järvenpää; Tamás Keleti
texts

eye 51

favorite 0

comment 0

We study parametrized families of orthogonal projections for which the dimension of the parameter space is strictly less than that of the Grassmann manifold. We answer the natural question of how much the Hausdorff dimension may decrease by verifying the best possible lower bound for the dimension of almost all projections of a finite measure. We also show that a similar result is valid for smooth families of maps from $n$-dimensional Euclidean space to $m$-dimensional one.
Source: http://arxiv.org/abs/1203.5296v1
Arxiv.org
- Alexander Hubbard; Axel Brandenburg
texts

eye 58

favorite 0

comment 0

At large magnetic Reynolds numbers, magnetic helicity evolution plays an important role in astrophysical large-scale dynamos. The recognition of this fact led to the development of the dynamical alpha quenching formalism, which predicts catastrophically low mean fields in open systems. Here we show that in oscillatory alpha-Omega dynamos this formalism predicts an unphysical magnetic helicity transfer between scales. An alternative technique is proposed where this artifact is removed by using...
Source: http://arxiv.org/abs/1107.0238v2
Arxiv.org
- Ahmet A. Husainov; Ekaterina S. Kudryashova
texts

eye 91

favorite 0

comment 0

The paper is devoted to a mathematical model of concurrency the special case of which is asynchronous system. Distributed asynchronous automata are introduced here. It is proved that the Petri nets and transition systems with independence can be considered like the distributed asynchronous automata. Time distributed asynchronous automata are defined in standard way by the map which assigns time intervals to events. It is proved that the time distributed asynchronous automata are generalized the...
Source: http://arxiv.org/abs/1203.3098v1
Mountain pine beetle galleries under the bark of a recently-killed sugar pine. Photo by: Ellen Michaels Goheen or Donald J. Goheen Date: c.2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection, Southwest Oregon Forest Insect and Disease Service Center Source: Goheen, E.M. and Goheen, D.J., 2014. Status of sugar and western white pines on federal forest lands in southwest Oregon: Inventory query and natural stand survey results. Pacific Northwest...
Topics: r6, usda, stateandprivateforestry, treedamage, foresthealth, donaldjgoheen, ellenmichaelsgoheen,...
Arxiv.org
texts

eye 43

favorite 0

comment 0

Type Ia supernovae are thought to be caused by thermonuclear explosions of a carbon-oxygen white dwarf in close binary systems. In the single-degenerate scenario (SDS), the companion star is non-degenerate and can be significantly affected by the explosion. We explore this interaction by means of multi-dimensional adaptive mesh refinement simulations using the FLASH code. We consider several different companion types, including main-sequence-like stars (MS), red giants (RG), and helium stars...
Source: http://arxiv.org/abs/1203.1932v2
Arxiv.org
texts

eye 51

favorite 0

comment 0

A nonpolynomial one-dimensional quantum potential in the form of an isotonic oscillator (harmonic oscillator with a centripetal barrier) is studied. We provide the non-relativistic bound state energy spectrum E_{n} and the wave functions {\psi}_{n}(x) in terms of the associated Laguerre polynomials in the framework of the Nikiforov-Uvarov method. Under the spin and pseudospin symmetric limits, the analytic eigenvalues and the corresponding two-component upper- and lower-spinors of the Dirac...
Source: http://arxiv.org/abs/1203.1736v2
Arxiv.org
- Jose M. Torrejon; Norbert S. Schulz; Michael A. Nowak
texts

eye 59

favorite 0

comment 0

We present an analysis of a pointed 141 ks Chandra high resolution transmission gratings observation of the Be X-ray emitting star HD110432, a prominent member of the gamma Cas analogs. The Chandra lightcurve shows a high variability but its analysis fails to detect any coherent periodicity up to a frequency of 0.05 Hz. The analysis of the Chandra HETG spectrum shows that, to correctly describe the spectrum, three model components are needed. Two of those components are optically thin thermal...
Source: http://arxiv.org/abs/1203.1004v1
Arxiv.org
texts

eye 81

favorite 0

comment 0

We construct the de Sitter QED in Coulomb gauge assuming that the quantum modes are prepared by a global apparatus which is able to determine a stable and invariant vacuum state, independent on the local coordinates. Then we proceed in traditional manner postulating the appropriate equal-time commutators and anti-commutators of the interacting fields and deriving the perturbation expansion of the scattering operator. In this approach the $in -out$ transitions amplitudes, measured by the same...
Source: http://arxiv.org/abs/1007.4647v4
Deb Cotton Secondline Collection
- BigRedCotton
movies

eye 13

favorite 0

comment 0

Source: https://www.youtube.com/watch?v=Adyy7onr7a4 Uploader: BigRedCotton Upload date: 20120412
Topics: Youtube, video, Music, clip, 2012, 01, 22, 14, 43, 27, debcotton, debcottonsecondlinecollection,...
Arxiv.org
- S. Sorathia; F. M. Izrailev; V. G. Zelevinsky; G. L. Celardo
texts

eye 98

favorite 0

comment 0

Using the phenomenological expression for the level spacing distribution with only one parameter, $0 \leq \beta \leq \infty$, covering all regimes of chaos and complexity in a quantum system, we show that transport properties of the one-dimensional Anderson model of finite size can be expressed in terms of this parameter. Specifically, we demonstrate a strictly linear relation between $\beta$ and the normalized localization length for the whole transition from strongly localized to extended...
Source: http://arxiv.org/abs/1107.2371v2
Arxiv.org
- Ayten Koç; Songül Esin; Ismail Güloğlu; Müge Kanuni; Ayten Koc; Songul Esin; Ismail Guloglu; Muge Kanuni
texts

eye 93

favorite 0

comment 0

Any finite dimensional semisimple algebra A over a field K is isomorphic to a direct sum of finite dimensional full matrix rings over suitable division rings. In this paper we will consider the special case where all division rings are exactly the field K. All such finite dimensional semisimple algebras arise as a finite dimensional Leavitt path algebra. For this specific finite dimensional semisimple algebra A over a field K, we define a uniquely detemined specific graph - which we name as a...
Source: http://arxiv.org/abs/1203.1405v1
Deb Cotton Secondline Collection
- BigRedCotton
movies

eye 7

favorite 0

comment 0

Source: https://www.youtube.com/watch?v=EhMDOJ5UCyQ Uploader: BigRedCotton Upload date: 20120212
Topics: Youtube, video, News & Politics, clip, 2012, 02, 05, 14, 49, 51, debcotton,...
Arxiv.org
- Mladen Bestvina; Mark Feighn
texts

eye 42

favorite 0

comment 0

We prove that the complex of free factors of a free group of finite rank is hyperbolic.
Source: http://arxiv.org/abs/1107.3308v3
Arxiv.org
- R. Köhler; T. Ratzka; Ch. Leinert
texts

eye 55

favorite 0

comment 0

We present a study of the orbits of the triple system LHS1070, with the aim to determine individual masses of its components. Sixteen new relative astrometric positions of the three components in the K band were obtained with NACO at the VLT, Omega CASS at the 3.5m telescope on Calar Alto, and other high-spatial-resolution instruments. We combine them with data from the literature and fit orbit models to the dataset. We derive an improved fit for the orbit of LHS1070B and C around each other,...
Source: http://arxiv.org/abs/1203.6270v1
Arxiv.org
- A. T. Hatke; M. A. Zudov; J. D. Watson; M. J. Manfra
texts

eye 77

favorite 0

comment 0

We report on a remarkably strong, and a rather sharp, photoresistance peak originating from a dimensional magnetoplasmon resonance (MPR) in a high mobility GaAs/AlGaAs quantum well driven by microwave radiation into a zero-resistance state (ZRS). The analysis of the MPR signalreveals a negative background providing experimental evidence for the concept of absolute negative resistance associated with the ZRS. When a system is further subject to a dc field, the maxima of microwave-induced...
Source: http://arxiv.org/abs/1203.4781v1
Arxiv.org
- Alexey Radul; Barak A. Pearlmutter; Jeffrey Mark Siskind
texts

eye 92

favorite 0

comment 0

We describe an implementation of the Farfel Fortran AD extensions. These extensions integrate forward and reverse AD directly into the programming model, with attendant benefits to flexibility, modularity, and ease of use. The implementation we describe is a "prepreprocessor" that generates input to existing Fortran-based AD tools. In essence, blocks of code which are targeted for AD by Farfel constructs are put into subprograms which capture their lexical variable context, and these...
Source: http://arxiv.org/abs/1203.1450v2
Arxiv.org
- C. Wetterich
texts

eye 132

favorite 0

comment 0

In models of emergent gravity the metric arises as the expectation value of some collective field. Usually, many different collective fields with appropriate tensor properties are candidates for a metric. Which collective field describes the "physical geometry"? We resolve this "metric ambiguity" by an investigation of the most general form of the quantum effective action for several metrics. In the long-distance limit the physical metric is universal and accounts for a...
Source: http://arxiv.org/abs/1203.5214v1
one of my favorite songs played by my favorite band. Source: https://www.youtube.com/watch?v=yoXTiRRrtck Uploader: BigRedCotton Upload date: 20120226
Topics: Youtube, video, Music, TBC Brass Band, To Be Continued Brass Band, New Orleans, Second Line parade,...
Arxiv.org
texts

eye 41

favorite 0

comment 0

This work proposes two models of neutrino masses that predict non-zero $\theta_{13}$ under the non-Abelian discrete flavor symmetry $\mathbb{S}_3\otimes\mathbb{Z}_2$. We advocate that the size of $\theta_{13}$ is understood as a group theoretical consequence rather than a perturbed effect from the tri-bi-maximal mixing. So, the difference of two models is designed only in terms of the flavor symmetry, by changing the charge assignment of righthanded neutrinos. The PMNS matrix in the first model...
Source: http://arxiv.org/abs/1203.1593v3
Arxiv.org
texts

eye 35

favorite 0

comment 0

We demonstrate how primary decomposition of commutative monoid congruences fails to capture the essence of primary decomposition in commutative rings by exhibiting a more sensitive theory of mesoprimary decomposition of congruences, complete with witnesses, associated prime objects, and an analogue of irreducible decomposition called coprincipal decomposition. We lift the combinatorial theory of mesoprimary decomposition to binomial ideals in monoid algebras. The resulting binomial mesoprimary...
Source: http://arxiv.org/abs/1107.4699v3
Arxiv.org
- J. Belfi; N. Beverini; G. Carelli; A. Di Virgilio; E. Maccioni; G. Saccorotti; F. Stefani; A. Velikoseltsev
texts

eye 51

favorite 0

comment 0

We report the observation of the ground rotation induced by the Mw=9.0, 11th of March 2011, Japan earthquake. The rotation measurements have been conducted with a ring laser gyroscope operating in a vertical plane, thus detecting rotations around the horizontal axis. Comparison of ground rotations with vertical accelerations from a co-located force-balance accelerometer shows excellent ring laser coupling at periods longer than 100s. Under the plane wave assumption, we derive a theoretical...
Source: http://arxiv.org/abs/1203.2277v1
Arxiv.org
- Andrew Schechtman-Rook; Kelley M. Hess
texts

eye 53

favorite 0

comment 0

We report the discovery of a UV-bright tidal dwarf galaxy candidate in the NGC 4631/4656 galaxy group, which we designate NGC 4656UV. Using survey and archival data spanning from 1.4 GHz to the ultraviolet we investigate the gas kinematics and stellar properties of this system. The HI morphologies of NGC 4656UV and its parent galaxy NGC 4656 are extremely disturbed, with significant amounts of counterrotating and extraplanar gas. From UV-FIR photometry, computed using a new method to correct...
Source: http://arxiv.org/abs/1203.1319v1
Arxiv.org
texts

eye 67

favorite 0

comment 0

The half-filled ground state of the Hubbard model on the hypercubic lattice in D dimensions is studied by the Kondo-lattice theory, which is none other than the 1/D expansion theory, but within the constrained Hilbert subspace where no symmetry is allowed to be broken. A gap can open in the single-particle excitation spectrum if and only if the residual entropy or entropy at T=+0 K is nonzero. The Mott insulator with no symmetry broken, if it is possible, is characterized by nonzero residual...
Source: http://arxiv.org/abs/1203.3576v2
Deb Cotton Secondline Collection
- BigRedCotton
movies

eye 17

favorite 0

comment 0

Source: https://www.youtube.com/watch?v=tWj-KABvDu8 Uploader: BigRedCotton Upload date: 20120411
Topics: Youtube, video, Music, clip, 2012, 01, 22, 11, 27, 04, debcotton, debcottonsecondlinecollection,...
Arxiv.org
- Péter L. Erdős; Claude Tardif; Gábor Tardos
texts

eye 46

favorite 0

comment 0

We characterize obstruction sets in caterpillar dualities in terms of regular languages, and give a construction of the dual of a regular family of caterpillars. We show that these duals correspond to the constraint satisfaction problems definable by a monadic linear Datalog program with at most one EDB per rule.
Source: http://arxiv.org/abs/1203.1347v1
The Berry phase acquired by an electromagnetic field undergoing an adiabatic and cyclic evolution in phase space is a purely quantum-mechanical effect of the field. However, this phase is usually accompanied by a dynamical contribution and cannot be manifested in any light-beam interference experiment because it is independent of the field state. We here show that such a phase can be produced using an atom coupled to a quantized field and driven by a slowly changing classical field, and it is...
Source: http://arxiv.org/abs/1203.0356v1
Arxiv.org
texts

eye 102

favorite 0

comment 0

In a three-dimensional Fermi liquid, quasiparticles near the Fermi surface may possess a Berry curvature. We show that if the Berry curvature has a nonvanishing flux through the Fermi surface, the particle number associated with this Fermi surface has a triangle anomaly in external electromagnetic fields. We show how Landau's Fermi liquid theory should be modified to take into account the Berry curvature. We show that the "chiral magnetic effect" also emerges from the Berry curvature...
Source: http://arxiv.org/abs/1203.2697v2
Arxiv.org
- Jon. Aaronson; Maryam Hosseini; Mariusz Lemanczyk
texts

eye 53

favorite 0

comment 0

We examine the class of increasing sequences of natural numbers which are IP-rigidity sequences for some weakly mixing probability preserving transformation. This property is closely related to the uncountability of the eigenvalue group of a corresponding non-singular transformation. We give examples, including a super-lacunary sequence which is not IP-rigid.
Source: http://arxiv.org/abs/1203.2257v4
Deb Cotton Secondline Collection
- BigRedCotton
movies

eye 18

favorite 0

comment 0

Source: https://www.youtube.com/watch?v=oXsAnoNENSA Uploader: BigRedCotton Upload date: 20120211
Topics: Youtube, video, News & Politics, clip, 2012, 02, 05, 11, 00, 43, debcotton,...
Playing Little Wayne's 'Hoes'. The sidewalk LOVED this song! Source: https://www.youtube.com/watch?v=BIOeRYUWUng Uploader: BigRedCotton Upload date: 20120227
Topics: Youtube, video, Music, TBC Brass Band, To Be Continued Brass Band, New Orleans, Second Line Parade,...
Arxiv.org
texts

eye 38

favorite 0

comment 0

Removal of the quenched approximation in the mechanism which produced an analytic estimate of quark-binding potentials, along with a reasonable conjecture of the color structure of the nucleon formed by such a binding potential, is shown to generate an effective, nucleon scattering and binding potential. The mass-scale factor on the order of the pion mass, previously introduced to define transverse imprecision of quark coordinates, is again used, while the strength of the potential is...
Source: http://arxiv.org/abs/1203.6137v1
Arxiv.org
texts

eye 114

favorite 0

comment 0

We use Young's raising operators to derive a Pieri rule for the ring generated by the indeterminates $h_{r,s}$ given in Macdonald's 9th Variation of the Schur functions. Under an appropriate specialisation of $h_{r,s}$, we derive the Pieri rule for the ring $\La(a)$ of double symmetric functions, which has a basis consisting of the double Schur functions. Together with a suitable interpretation of the Jacobi--Trudi identity, our Pieri rule allows us to obtain a new proof of a rule to calculate...
Source: http://arxiv.org/abs/1203.4729v1
Arxiv.org
- Aldo V. Figallo; Gustavo Pelaitay
texts

eye 101

favorite 0

comment 0

In 1982, L. Iturrioz introduced symmetrical Heyting algebras of order n (or SHn-algebras). In this paper, we define and study tense SHn-algebras namely, SHn-algebras endowed with two tense operators. These algebras constitute a generalization of tense Lukasiewicz-Moisil algebras. Our main interest is the duality theory for tense SHn- algebras. In order to do this, we requiere Esakia's duality for Heyting algebras and Goldblatt's duality for bounded distributive lattices with operations.
Source: http://arxiv.org/abs/1203.5459v1
Arxiv.org
texts

eye 52

favorite 0

comment 0

We theoretically study a charge qubit interacting with electrons in a semi-infinite 1D wire. The system displays the physics of the Fermi edge singularity. Our results generalize known results for the Fermi-edge system to the regime where excitations induced by the qubit can resolve the spatial structure of the scattering region. We find resonant features in the qubit tunneling rate as a function of the qubit level splitting. They occur at integer multiples of h times v_F/l. Here v_F is the...
Source: http://arxiv.org/abs/1203.6567v1
Arxiv.org
- Juyeon Yi; Peter Talkner; Gert-Ludwig Ingold
texts

eye 38

favorite 0

comment 0

The influence of repeated projective measurements on the dynamics of the state of a quantum system is studied in dependence of the time lag $\tau$ between successive measurements. In the limit of infinitely many measurements of the occupancy of a single state the total system approaches a uniform state. The asymptotic approach to this state is exponential in the case of finite Hilbert space dimension. The rate characterizing this approach undergoes a sharp transition from a monotonically...
Source: http://arxiv.org/abs/1107.5413v2
Arxiv.org
- Ernst Trojan
texts

eye 79

favorite 0

comment 0

We consider a system of many fermionic tachyons coupled to a scalar, pseudoscalar, vector and pseudovector fields. The scalar and pseudoscalar fields are responsible for the effective mass, while the pseudovector field is similar to ordinary electromagnetic field. The action of vector field $\omega_\mu$ results in tachyonic dispersion relation $\varepsilon_p=\sqrt{p^2+g^2\omega_0^2-hpg\omega_0-g\vec \sigma \cdot \nabla \omega_0-m^2} -g\vec \sigma \cdot \vec \omega$ that depends on helicity $h$...
Source: http://arxiv.org/abs/1203.5241v3
Arxiv.org
- S. Iubini; R. Franzosi; R. Livi; G. -L. Oppo; A. Politi
texts

eye 31

favorite 0

comment 0

We explore the statistical behavior of the discrete nonlinear Schroedinger equation. We find a parameter region where the system evolves towards a state characterized by a finite density of breathers and a negative temperature. Such a state is metastable but the convergence to equilibrium occurs on astronomical time scales and becomes increasingly slower as a result of a coarsening processes. Stationary negative-temperature states can be experimentally generated via boundary dissipation or from...
Source: http://arxiv.org/abs/1203.4162v1
Arxiv.org
- Carlos Pedro Gonçalves
texts

eye 170

favorite 0

comment 0

Financial volatility risk and its relation to a business cycle-related intrinsic time is addressed through a multiple round evolutionary quantum game equilibrium leading to turbulence and multifractal signatures in the financial returns and in the risk dynamics. The model is simulated and the results are compared with actual financial volatility data.
Source: http://arxiv.org/abs/1107.2562v2
Arxiv.org
texts

eye 63

favorite 0

comment 0

Two-sample inference for the difference of population means typically relies upon a Central Limit Theorem approximation. When data are drawn from a Negative Binomial distribution, previous work of Shilane et al. (2010) showed that a Normal approximation is often unreliable in one-sample inference and proposed alternative techniques. We seek to extend these methods to the problem of two-sample inference on the difference of sample means in highly dispersed Negative Binomial models. We...
Source: http://arxiv.org/abs/1203.0812v1
Arxiv.org
- Takeshi Kobayashi; Tomo Takahashi
texts

eye 41

favorite 0

comment 0

We investigate the scale-dependence, or the runnings, of linear and second order density perturbations generated in various curvaton scenarios. We argue that the second order perturbations, i.e. non-Gaussianity, can strongly depend on the scale, even when the linear perturbations are nearly scale-invariant. We present analytic formulae for the runnings from curvatons with general energy potentials, and clarify the conditions under which fNL becomes strongly scale-dependent. From the point of...
Source: http://arxiv.org/abs/1203.3011v2
Arxiv.org
texts

eye 99

favorite 0

comment 0

Present experiments do not exclude that the neutron transforms into some invisible degenerate twin, so called mirror neutron, with an appreciable probability. These transitions are actively studied by monitoring neutron losses in ultra-cold neutron traps, where they can be revealed by their magnetic field dependence. In this work we reanalyze the experimental data acquired by the group of A.P. Serebrov at Institute Laue-Langevin, and find a dependence at more than 5\sigma\ away from the null...
Source: http://arxiv.org/abs/1203.1035v1
Arxiv.org
- Maité Dupuis; Laurent Freidel; Etera R. Livine; Simone Speziale
texts

eye 50

favorite 0

comment 0

We develop an Hamiltonian representation of the sl(2,C) algebra on a phase space consisting of N copies of twistors, or bi-spinors. We identify a complete set of global invariants, and show that they generate a closed algebra including gl(N,C) as a subalgebra. Then, we define the linear and quadratic simplicity constraints which reduce the spinor variables to (framed) 3d spacelike polyhedra embedded in Minkowski spacetime. Finally, we introduce a new version of the simplicity constraints which...
Source: http://arxiv.org/abs/1107.5274v2
Arxiv.org
- Viktor Bekkert; Georgia Benkart; Vyacheslav Futorny; Iryna Kashuba
texts

eye 65

favorite 0

comment 0

We study $\mathbb Z$-graded modules of nonzero level with arbitrary weight multiplicities over Heisenberg Lie algebras and the associated generalized loop modules over affine Kac-Moody Lie algebras. We construct new families of such irreducible modules over Heisenberg Lie algebras. Our main result establishes the irreducibility of the corresponding generalized loop modules providing an explicit construction of many new examples of irreducible modules for affine Lie algebras. In particular, to...
Source: http://arxiv.org/abs/1107.0893v2
Arxiv.org
- John H. Castillo; Gilberto García-Pulgarín; Juan Miguel Velásquez-Soto
texts

eye 39

favorite 0

comment 0

We give new characterizations of the Midy's property and using these results we obtain a new proof of a special case of the Dirichlet's theorem about primes in arithmetic progression.
Source: http://arxiv.org/abs/1203.1273v1
Arxiv.org
texts

eye 52

favorite 0

comment 0

We give a new link spam detection and PageRank demotion algorithm called MaxRank. Like TrustRank and AntiTrustRank, it starts with a seed of hand-picked trusted and spam pages. We define the MaxRank of a page as the frequency of visit of this page by a random surfer minimizing an average cost per time unit. On a given page, the random surfer selects a set of hyperlinks and clicks with uniform probability on any of these hyperlinks. The cost function penalizes spam pages and hyperlink removals....
Source: http://arxiv.org/abs/1203.1457v1
Deb Cotton Secondline Collection
- BigRedCotton
movies

eye 19

favorite 0

comment 0

Source: https://www.youtube.com/watch?v=rQs5ffRPG4w Uploader: BigRedCotton Upload date: 20120211
Topics: Youtube, video, News & Politics, clip, 2012, 02, 05, 11, 00, 44, debcotton,...
Arxiv.org
- Raphaël Danchin; Piotr B. Mucha
texts

eye 60

favorite 0

comment 0

We investigate the incompressible Navier-Stokes equations with variable density. The aim is to prove existence and uniqueness results in the case of discontinuous ini- tial density. In dimension n = 2, 3, assuming only that the initial density is bounded and bounded away from zero, and that the initial velocity is smooth enough, we get the local-in-time existence of unique solutions. Uniqueness holds in any dimension and for a wider class of velocity fields. Let us emphasize that all those...
Source: http://arxiv.org/abs/1203.1131v1
Arxiv.org
- F. Dahlem; T. Kociniewski; C. Marcenat; A. Grockowiak; L. Pascal; P. Achatz; J. Boulmer; D. Debarre; T. Klein; E. Bustarret; H. Courtois
texts

eye 46

favorite 0

comment 0

Scanning tunneling spectroscopies in the subKelvin temperature range were performed on superconducting Silicon epilayers doped with Boron in the atomic percent range. The resulting local differential conductance behaved as expected for a homogeneous superconductor, with an energy gap dispersion below +/- 10%. The spectral shape, the amplitude and temperature dependence of the superconductivity gap follow the BCS model, bringing further support to the hypothesis of a hole pairing mechanism...
Source: http://arxiv.org/abs/1007.3598v2
Arxiv.org
texts

eye 36

favorite 0

comment 0

Measurements of magnetic hysteresis loops in single Co nanoparticles at dilution refrigerator temperatures are presented. The nanoparticles are in electric contact with bulk Al leads via tunnel junctions. The tunnel current versus magnetic field displays a magnetic hysteresis loop. The magnetic switching field is reduced by current, and the magnetization of the nanoparticle can be switched by applying a voltage pulse, demonstrating that the magnetic stability of the nanoparticle is diminished...
Source: http://arxiv.org/abs/1107.2850v3
In a previous work [Phys. Rev. A 85, 022502 (2012)] we calculated, with the use of our Gaussian expansion method for few-body systems, the energy levels and spatial structure of the 4He trimer and tetramer ground and excited states using the LM2M2 potential, which has a very strong short-range repulsion. In this work, we calculate the same quantities using the presently most accurate 4He-4He potential [M. Przybytek et al., Phys. Rev. Lett. 104, 183003 (2010)] that includes the adiabatic,...
Source: http://arxiv.org/abs/1203.3130v2
Avian excavation in western white pine snag. Cascade Mountains, Southwest Oregon. Photo by: Ellen Michaels Goheen or Donald J. Goheen Date: c.2012 Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection, Southwest Oregon Forest Insect and Disease Service Center Source: Goheen, E.M. and Goheen, D.J., 2014. Status of sugar and western white pines on federal forest lands in southwest Oregon: Inventory query and natural stand survey results. Pacific Northwest...
Topics: r6, usda, stateandprivateforestry, avianexcavation, foresthealth, donaldjgoheen, region6,...
Arxiv.org
- Zhicheng Zhong; G. Koster; Paul J. Kelly
texts

eye 39

favorite 0

comment 0

Competition between electronic and atomic reconstruction is a constantly recurring theme in transition-metal oxides. We use density functional theory calculations to study this competition for a model system consisting of a thin film of the polar, infinite-layer structure ACuO2 (A=Ca, Sr, Ba) grown on a nonpolar, perovskite SrTiO3 substrate. A transition from the bulk planar structure to a chain-type thin film accompanied by substantial changes to the electronic structure is predicted for a...
Source: http://arxiv.org/abs/1203.5686v1
Cluster decays of rare-earth nuclei are studied with a view to look for neutron magic shells for the $_{50}$Sn nucleus as the daughter product always. The $^{100}$Sn and $^{132}$Sn radioactivities are studied to find the most probable cluster decays and the possibility, if any, of new neutron shells. For a wide range of parent nuclei considered here (from Ba to Pt) $^{12}$C from $^{112}$Ba and $^{78}$Ni from $^{210}$Pt parent are predicted to be the most probable clusters (minimum decay...
Source: http://arxiv.org/abs/1107.2532v3
playing 'I Got A Big Fat Woman' Source: https://www.youtube.com/watch?v=UGuGuIbR3jE Uploader: BigRedCotton Upload date: 20121116
Topics: Youtube, video, Music, Treme, Second line, brass band, parade, New Orleans, jazz, brass music, live...
Arxiv.org
- Maria Joita; Mohammad Sal Moslehian
texts

eye 92

favorite 0

comment 0

In this paper we introduce a notion of Morita equivalence for Hilbert C*-modules in terms of the Morita equivalence of the algebras of compact operators on Hilbert C*-modules. We investigate some properties of the new version of Morita equivalence and obtain some results. We then applied our results to study the continuous actions of locally compact groups on full Hilbert C*-modules. We present an extension of Green's theorem in the context of Hilbert C*-modules as well.
Source: http://arxiv.org/abs/1203.4425v1
Arxiv.org
- Andrej Bauer; Matija Pretnar
texts

eye 47

favorite 0

comment 0

Eff is a programming language based on the algebraic approach to computational effects, in which effects are viewed as algebraic operations and effect handlers as homomorphisms from free algebras. Eff supports first-class effects and handlers through which we may easily define new computational effects, seamlessly combine existing ones, and handle them in novel ways. We give a denotational semantics of eff and discuss a prototype implementation based on it. Through examples we demonstrate how...
Source: http://arxiv.org/abs/1203.1539v1
In this article the linear Boltzmann equation is derived for a particle interacting with a Gaussian random field, in the weak coupling limit, with renewal in time of the random field. The initial data can be chosen arbitrarily. The proof is geometric and involves coherent states and semi-classical calculus.
Source: http://arxiv.org/abs/1107.0788v2
Deb Cotton Secondline Collection
- BigRedCotton
movies

eye 20

favorite 0

comment 0

Source: https://www.youtube.com/watch?v=VBAI0jFcjxk Uploader: BigRedCotton Upload date: 20120528
Topics: Youtube, video, Entertainment, clip, 2012, 05, 13, 11, 57, 42, debcotton,...
beautiful!! Source: https://www.youtube.com/watch?v=grgEgb4CcDE Uploader: BigRedCotton Upload date: 20120227
Topics: Youtube, video, News & Politics, Stooges Brass Band, New Orleans, Second Line Parade, Ninth...
Arxiv.org
- Omer Angel; Alexander E. Holroyd; Gady Kozma; Johan Wästlund; Peter Winkler
texts

eye 65

favorite 0

comment 0

A dyadic tile of order n is any rectangle obtained from the unit square by n successive bisections by horizontal or vertical cuts. Let each dyadic tile of order n be available with probability p, independently of the others. We prove that for p sufficiently close to 1, there exists a set of pairwise disjoint available tiles whose union is the unit square, with probability tending to 1 as n->infinity, as conjectured by Joel Spencer in 1999. In particular we prove that if p=7/8, such a tiling...
Source: http://arxiv.org/abs/1107.2636v3
Arxiv.org
texts

eye 39

favorite 0

comment 0

We study the possibility that the very broad (~1500 km/s) and luminous (L_5007 ~ 1.4e37 erg/s) [OIII] line emission observed in the globular cluster RZ 2109 might be explained with the photoionization of nova ejecta by the bright (L_X ~ 4e39 erg/s) X-ray source hosted in the same globular cluster. We find that such scenario is plausible and explains most of the features of the RZ 2109 spectrum (line luminosity, absence of H emission lines, peculiar asymmetry of the line profile); on the other...
Source: http://arxiv.org/abs/1203.4233v1
Arxiv.org
texts

eye 97

favorite 0

comment 0

We report on a search for the supersymmetric partner of the top quark (scalar top) decaying into a charm quark and a neutralino in p-pbar collisions at sqrt(s)=1.96 TeV. The data sample, collected by the CDFII detector at the Fermilab Tevatron, corresponds to an integrated luminosity of 2.6 fb-1. Candidate events are selected by requiring two or more jets and a large imbalance in the transverse momentum. To enhance the analysis sensitivity, at least one of the jets is required to be identified...
Source: http://arxiv.org/abs/1203.4171v3
Arxiv.org
- Edouard Hannezo; Jacques Prost; Jean-Francois Joanny
texts

eye 109

favorite 0

comment 0

We study theoretically the shapes of a dividing epithelial monolayer of cells lying on top of an elastic stroma. The negative tension created by cell division provokes a buckling instability at a finite wave vector leading to the formation of periodic arrays of villi and crypts. The instability is similar to the buckling of a metallic plate under compression. We use the results to rationalize the various structures of the intestinal lining observed \emph{in vivo}. Taking into account the...
Source: http://arxiv.org/abs/1203.2080v1
Arxiv.org
- Mohammad Naghshvar; Tara Javidi
texts

eye 50

favorite 0

comment 0

Consider a decision maker who is responsible to dynamically collect observations so as to enhance his information in a speedy manner about an underlying phenomena of interest while accounting for the penalty of wrong declaration. The special cases of the problem are shown to be that of noisy dynamic search and variable-length coding with feedback. Due to the sequential nature of the problem, the decision maker relies on his current information state to adaptively select the most...
Source: http://arxiv.org/abs/1203.4626v3
Arxiv.org
- X. Chen; M. Chen; B. Li; Y. Zhao; Y. Wu; J. Li
texts

eye 92

favorite 0

comment 0

In this paper, we attempt to revisit the problem of multi-party conferencing from a practical perspective, and to rethink the design space involved in this problem. We believe that an emphasis on low end-to-end delays between any two parties in the conference is a must, and the source sending rate in a session should adapt to bandwidth availability and congestion. We present Celerity, a multi-party conferencing solution specifically designed to achieve our objectives. It is entirely...
Source: http://arxiv.org/abs/1107.1138v4
We present the first search for supersymmetry (SUSY) in Zgamma final states with large missing transverse energy using data corresponding to an integrated luminosity of 6.2 fb-1 collected with the D0 experiment in ppbar collisions at sqrt(s)=1.96 TeV. This signature is predicted in gauge-mediated SUSY-breaking models, where the lightest neutralino is the next-to-lightest supersymmetric particle (NLSP) and is produced in pairs, possibly through decay from heavier supersymmetric particles. The...
Source: http://arxiv.org/abs/1203.5311v1
Arxiv.org
texts

eye 84

favorite 0

comment 0

We find an exact expression for the bipartite fidelity f=|'|^2, where |vac> is the vacuum eigenstate of an infinite-size antiferromagnetic XXZ chain and |vac>' is the vacuum eigenstate of an infinite-size XXZ chain which is split in two. We consider the quantity -ln(f) which has been put forward as a measure of quantum entanglement, and show that the large correlation length xi behaviour is consistent with a general conjecture -ln(f) ~ c/8 ln(xi), where c is the central charge of the UV...
Source: http://arxiv.org/abs/1203.2326v1
Arxiv.org
- Boris Buchmann; Gernot Müller
texts

eye 42

favorite 0

comment 0

GARCH is one of the most prominent nonlinear time series models, both widely applied and thoroughly studied. Recently, it has been shown that the COGARCH model (which was introduced a few years ago by Kl\"{u}ppelberg, Lindner and Maller) and Nelson's diffusion limit are the only functional continuous-time limits of GARCH in distribution. In contrast to Nelson's diffusion limit, COGARCH reproduces most of the stylized facts of financial time series. Since it has been proven that Nelson's...
Source: http://arxiv.org/abs/1203.0186v1
Arxiv.org
texts

eye 45

favorite 0

comment 0

This paper considers receding horizon control of finite deterministic systems, which must satisfy a high level, rich specification expressed as a linear temporal logic formula. Under the assumption that time-varying rewards are associated with states of the system and they can be observed in real-time, the control objective is to maximize the collected reward while satisfying the high level task specification. In order to properly react to the changing rewards, a controller synthesis framework...
Source: http://arxiv.org/abs/1203.2860v1
Arxiv.org
- Masaomi Ono; Masa-aki Hashimoto; Shin-ichiro Fujimoto; Kei Kotake; Shoichi Yamada
texts

eye 39

favorite 0

comment 0

We investigate the nucleosynthesis in a massive star of 70 M_solar with solar metallicity in the main sequence stage. The helium core mass after hydrogen burning corresponds to 32 M_solar. Nucleosynthesis calculations have been performed during the stellar evolution and the jetlike supernova explosion of a collapsar model, where the weak s-, p-, and r-processes are taken into account. We confirm that s-elements of 60 < A < 90 are highly overproduced relative to the solar abundances in the...
Source: http://arxiv.org/abs/1203.6488v2
Arxiv.org
- Roman Kompaneets; Alexei V. Ivlev; Sergey V. Vladimirov; Gregor E. Morfill
texts

eye 54

favorite 0

comment 0

The fundamental higher-order Landau plasma modes are known to be generally heavily damped. We show that these modes for the ion component in a weakly ionized plasma can be substantially modified by ion-neutral collisions and a dc electric field driving ion flow so that some of them can become unstable. This instability is expected to naturally occur in presheaths of gas discharges at sufficiently small pressures and thus affect sheaths and discharge structures.
Source: http://arxiv.org/abs/1007.0142v3
Arxiv.org
- Nebojsa Milosavljevic; Sameer Pawar; Salim El Rouayheb; Michael Gastpar; Kannan Ramchandran
texts

eye 97

favorite 0

comment 0

In this paper we study the multisource multicast problem where every sink in a given directed acyclic graph is a client and is interested in a common file. We consider the case where each node can have partial knowledge about the file as a side information. Assuming that nodes can communicate over the capacity constrained links of the graph, the goal is for each client to gain access to the file, while minimizing some linear cost function of number of bits transmitted in the network. We...
Source: http://arxiv.org/abs/1203.2298v1
The Daya Bay Collaboration has recently reported its first \bar{\nu}_e \to \bar{\nu}_e oscillation result which points to \theta_{13} \simeq 8.8^\circ \pm 0.8^\circ (best-fit \pm 1\sigma range) or \theta_{13} \neq 0^\circ at the 5.2\sigma level. The fact that this smallest neutrino mixing angle is not strongly suppressed motivates us to look into the underlying structure of lepton flavor mixing and CP violation. Two phenomenological strategies are outlined: (1) the lepton flavor mixing matrix U...
Source: http://arxiv.org/abs/1203.1672v2
Arxiv.org
- M. Cárdenas; F. F. Lasheras; A. Quintero; D. Repovš
texts

eye 39

favorite 0

comment 0

We present simple examples of finite-dimensional connected homogeneous spaces (they are actually topological manifolds) with nonhomogeneous and nonrigid factors. In particular, we give an elementary solution of an old problem in general topology concerning homogeneous spaces.
Source: http://arxiv.org/abs/1203.4151v2
Arxiv.org
texts

eye 45

favorite 0

comment 0

We present an extension of Nelson's stochastic quantum mechanics to finite temperature. Utilizing the formulation of Thermo Field Dynamics (TFD), we can show that Ito's stochastic equations for tilde and non-tilde particle positions reproduce the TFD-type Schr\"odinger equation which is equivalent to the Liouville-von Neumann equation. In our formalism, the drift terms in the Ito's stochastic equation have the temperature dependence and the thermal fluctuation is induced through the...
Source: http://arxiv.org/abs/1007.3603v2
Arxiv.org
- N. Peretto; Ph. Andre; V. Konyves; N. Schneider; D. Arzoumanian; P. Palmeirim; P. Didelon; M. Attard; J. P. Bernard; J. Di Francesco; D. Elia; M. Hennemann; T. Hill; J. Kirk; A. Men'shchikov; F. Motte; Q. Nguyen Luong; H. Roussel; T. Sousbie; L. Testi; D. Ward-Thompson; G. J. White; A. Zavagno
texts

eye 70

favorite 0

comment 0

A growing body of evidence indicates that the formation of filaments in interstellar clouds is a key component of the star formation process. In this paper, we present new Herschel PACS and SPIRE observations of the B59 and Stem regions in the Pipe Nebula complex, revealing a rich, organized network of filaments. The asymmetric column density profiles observed for several filaments, along with the bow-like edge of B59, indicates that the Pipe Nebula is being compressed from its western side,...
Source: http://arxiv.org/abs/1203.3403v1
Arxiv.org
- Joanna Woo; Avishai Dekel; S. M. Faber; Kai Noeske; David C. Koo; Brian F. Gerke; Michael C. Cooper; Samir Salim; Aaron A. Dutton; Jeffrey Newman; Benjamin J. Weiner; Kevin Bundy; Christopher N. A. Willmer; Marc Davis; Renbin Yan
texts

eye 46

favorite 0

comment 0

We study the dependence of star-formation quenching on galaxy mass and environment, in the SDSS (z~0.1) and the AEGIS (z~1). It is crucial that we define quenching by low star-formation rate rather than by red colour, given that one third of the red galaxies are star forming. We address stellar mass M*, halo mass Mh, density over the nearest N neighbours deltaN, and distance to the halo centre D. The fraction of quenched galaxies appears more strongly correlated with Mh at fixed M* than with M*...
Source: http://arxiv.org/abs/1203.1625v2