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Haji Sayed Daud interviewing Abrar Mergin, Babrak Shah Shinwari and Waziri Sahib about failure of communists coup (00:00:00)--Haji Sayed Daud interviewing Najib Aziz about his trip to Afghanistan and 'war affected children' organization activities in Afghanistan (02:06:26)
Topic: afghanistan
Afghan Media Resource Center
movies

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Beginning of Shurai Tafahum press conference about political solution of Afghanistan (00:00:00)--Haji Hayatullah speech about political solution of Afghanistan (00:15:36)--Professor Rasul Amin speech about political solution of Afghanistan (00:25:10)--Shahzada Masoud, Abdul Hussain Waiz, Abdullah Ghamkhor and other officials speeches about political solution of Afghanistan (00:35:48)
Topic: afghanistan
Afghan Media Resource Center
movies

eye 15

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Mr. Rustam Shah Mumand visiting AMRC office in Peshawar (00:00:00)--Third anniversary of Nangarhar cultural committee (00:15:50)--Mr. Muhmand Asef Samim, Nang Yousafzai, Pasarlai and Hayaturahman speeches (00:23:23)--Beginning of a poetry program (01:14:10)--Mr. Samim inaugurating the poetry program (01:59:31)--Mr. Amanullah Saho saying a poem at the end of the program (02:02:57)--Mr. Abdul Hamid Mubariz visiting AMRC office in Peshawar (02:04:32)
Topic: afghanistan
Afghan Media Resource Center
movies

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Funeral party of Professor Sidiqullah Rishtin (00:00:00)--Ajmal Khatak speech (00:07:10)--Celebration of International Paralyses Day, Samia Farzana and Sayed Aqa speeches about paralyses people (01:15:26)
Afghan Media Resource Center
movies

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Beginning of Shurai Tafahum press conference about Afghan refugees problems (00:00:00)--Haji Hayatullah speech about the solution of Afghan refugees problems (00:06:00)--Mavlavi Faqir Jan, Wali Muhammad Payman and Shahzada Masood speeches about the refugees problems (00:13:44)--Mavlavi Jora, Mujahid Nazir, Engineer Muslim, Sayed Ishaq Arab, professor Rasul Amin, Enigineer Abdul Zahir, Abdul Qayoum, Abdul Zahir Jabarkhil, Sayed Ahmad, Mavlavi Habibullah, Engineer Mahboob and Haji Lal Gul...
Topic: afghanistan
Afghan Media Resource Center
movies

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Haji Sayed Daud, Zubair Shafiqi, Afrazsiab Khattak, Karim Khuram, Habibullah Rafi, Zaman Muzamil, Shershah Yousafzai, Babrak Shinwari and Doctor Anwar discussing withdrawal of Soviet Union (00:00:00)
Topic: afghanistan
Afghan Media Resource Center
movies

eye 28

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comment 0

Zahoor Afghan interviewing Abdul Wahid Nohzat Farahi about Taliban behavior with local people (00:00:00)
Topic: afghanistan
Afghan Media Resource Center
movies

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Mia Gul Arwal interviewing Qutbuddin Hilal about the political situation of Afghanistan, Afghan refugees, Kabul victory and ensuring peace in Afghanistan (00:00:26)
Topic: afghanistan
Afghan Media Resource Center
movies

eye 23

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Beginning of a conference regarding peace and solidarity of Muslims in Afghanistan (00:00:00)--View of Ghamsharik, Jafar Sarwari and Danish Zaringar (00:07:15)--Interview with Sayed Ishaq Gilani about Jihad (00:36:27)--Zarghona speech (00:54:06)
Topic: afghanistan
Afghan Media Resource Center
movies

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Haji Abdul Wahab giving surveyors training (00:00:00)--Dr. Farooq Kamin giving surveyors training (00:03:40)--Haji Sayed Daud speech to surveyors (00:19:56)--Muhammad Asef Ikram giving surveyors training (00:37:40)--War between Shurai Nizar and Wahdat political parties in Kabul (00:42:31)
Afghan Media Resource Center
movies

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Abdul Wakil Akbarzai, Jamaima Khan and Maryam Bibi visiting Jolozo refugees camp and distributing goods to them (00:00:00)
Topic: afghanistan
Afghan Media Resource Center
movies

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James Richi and Katrine Porter expressing their views about Loya Jirga and peace process in Afghanistan (00:00:00)--Haji Sayed Daud speech about Jemes Richi (00:04:44)--Haji Abdul Haq, Haji Sayed Daud and Zahir Khan Jabarkhil speeches about Loya Jirga (00:12:28)--James Richi, Katrine Porter and other guests discussing Loya Jirga and peace process in Afghanistan (00:26:02)
Topic: afghanistan
Haji Sayed Daud interviewing Najib Aziz about 'war affected children' organization activities in Afghanistan (00:00:00)--Haji Sayed Daud interviewing Sayed Ishaq Gilani regarding political situation of Afghanistan and not participating of Gilani in Rome conference (00:03:28)
Topic: afghanistan
Afghan Media Resource Center
movies

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Zahoor Afghan interviewing commander Abdul Haq about returning of former king Zahir Shah to Afghanistan (00:00:00)--Interview with commander Abdulhaq about ensuring prolong security in Afghanistan and Taliban regime (00:05:31)
Topic: afghanistan
United Nation General Secretary; Kofi Anan visiting Shamshato camp (00:00:00)--Kofi Anan speech in Shamshato camp (00:33:14)--Kofi Anan leaving for Jolozo camp (00:46:38)--Haji Sayed Daud interviewing Abdulzahir Jabarkhil about Naser Bagh camp refugees (00:58:42)
Topic: afghanistan
Afghan Media Resource Center
movies

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Beginning of Shurai-i-Tafahum press conference about the effectiveness of Loya Jirga and former King Zahir Shah (00:00:00)--Mavlavi Sayed Ishaq Arab reciting Holy Quran (00:03:22)--Haji Hayatullah, Haji Sayed Daud, Pir Muhammad Itimadi, Zahir Khan Jabarkhil and Imami Ghori speeches about the importance of Loya Jirga and peace process in Afghanistan (00:14:55)--Haji Sayed Daud interviewing Pacha Khan Zadran about Rome conference, Taliban regime, Muj leaders, and former King Zahir Shah (01:31:28)
Topic: afghanistan
Afghan Media Resource Center
movies

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Beginning of a conference regarding solidarity of Afghan people and ensuring peace in Afghanistan (00:00:00)--Sayed Ishaq Gilani, Abdul Ahad Ashrati and Gul Rahman Qazi speeches about Afghanistan political situation (00:01:17)--National anthem by Aghan girls students (00:43:32)
Topic: afghanistan
Arxiv.org
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We study the resilience of complex networks against attacks in which nodes are targeted intelligently, but where disabling a node has a cost to the attacker which depends on its degree. Attackers have to meet these costs with limited resources, which constrains their actions. A network's integrity is quantified in terms of the efficacy of the process that it supports. We calculate how the optimal attack strategy and the most attack-resistant network degree statistics depend on the node removal...
Source: http://arxiv.org/abs/1005.4283v1
Arxiv.org
by A C C Coolen; J A F Heimel
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We solve the dynamics of the on-line minority game, with general types of decision noise, using generating functional techniques a la De Dominicis and the temporal regularization procedure of Bedeaux et al. The result is a macroscopic dynamical theory in the form of closed equations for correlation- and response functions defined via an effective continuous-time single-trader process, which are exact in both the ergodic and in the non-ergodic regime of the minority game. Our solution also...
Source: http://arxiv.org/abs/cond-mat/0107600v1
Arxiv.org
by A Donnachie; P V Landshoff
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Exclusive vector meson production from real and virtual photons is, for the most part, described well by soft pomeron exchange. However, there are some unsolved normalisation problems, and just a hint that an additional contribution from hard pomeron exchange may be needed.
Source: http://arxiv.org/abs/hep-ph/9411368v1
Arxiv.org
by A Donnachie; P V Landshoff
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The ZEUS data on the charm structure function F_2^c at small x fit well to a single power of x, corresponding to the exchange of a hard pomeron that is flavour-blind. When combined with the contribution from the exchange of a soft pomeron, the hard pomeron gives a good description of elastic $J/\psi$ photoproduction.
Source: http://arxiv.org/abs/hep-ph/9910262v2
Arxiv.org
texts

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We derive determinant expressions for domain wall partition functions of level-1 affine so(n) vertex models, n >= 4, at discrete values of the crossing parameter lambda = m pi / 2(n-3), m in Z, in the critical regime.
Source: http://arxiv.org/abs/math-ph/0604006v1
Arxiv.org
by A F Garcia Marin; V Wand; F Steier; F Guzman Cervantes; J Bogenstahl; O Jennrich; G Heinzel; K Danzmann
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This paper presents a procedure to perform fully autonomous on-orbit alignment of the interferometer on board the LISA Technology Package (LTP). LTP comprises two free-floating test masses as inertial sensors that additionally serve as end mirrors of a set of interferometers. From the output signals of the interferometers, a subset has been selected to obtain alignment information of the test masses. Based on these signals, an alignment procedure was developed and successfully tested on the...
Source: http://arxiv.org/abs/physics/0604011v1
Arxiv.org
by A J Aspden; J B Bell; S E Woosley
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In the distributed burning regime, turbulence disrupts the internal structure of the flame, and so the idea of laminar burning propagated by conduction is no longer valid. The nature of the burning depends on the turbulent Damkohler number (Da), which steadily declines from much greater than one to less that one as the density decreases to a few 10^6 g/cc. Scaling arguments predict that the turbulent flame speed s, normalized by the turbulent intensity u, follows s/u=Da^1/2 for Da 1, and that...
Source: http://arxiv.org/abs/1107.2421v1
Arxiv.org
by A J Aspden; J B Bell; S E Woosley
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In previous studies, we examined turbulence-flame interactions in carbon-burning thermonuclear flames in Type Ia supernovae. In this study, we consider turbulence-flame interactions in the trailing oxygen flames. The two aims of the paper are to examine the response of the inductive oxygen flame to intense levels of turbulence, and to explore the possibility of transition to detonation in the oxygen flame. Scaling arguments analogous to the carbon flames are presented and then compared against...
Source: http://arxiv.org/abs/1107.2424v1
Arxiv.org
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It is shown that the fidelity of the dynamically evolved system with its earlier time density matrix provides a signature of non-Markovian dynamics. Also, the fidelity associated with the initial state and the dynamically evolved state is shown to be larger in the non-Markovian evolution compared to that in the corresponding Markovian case. Starting from the Kraus representation of quantum evolution, the Markovian and non-Markovian features are discerned in its short time structure. These two...
Source: http://arxiv.org/abs/1007.4498v3
Arxiv.org
by A Kambili; A B Walker; F Qiu; A C Fisher; A D Savin; L M Peter
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Dye sensitised nanocrystalline solar cells (Gr\"{a}tzel cells) have achieved solar-to-electrical energy conversion efficiencies of 12% in diffuse daylight. The cell is based on a thin film of dye-sensitised nanocrystalline TiO$_2$ interpenetrated by a redox electrolyte. The high surface area of the TiO$_2$ and the spectral characteristics of the dye allow the device to harvest 46% of the solar energy flux. One of the puzzling features of dye-sensitised nano-crystalline solar cells is the...
Source: http://arxiv.org/abs/cond-mat/0107551v1
Arxiv.org
by A Klopotowski; M G Nadkarni; K P S Bhaskara Rao
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We propose here a multidimensional generalisation of the notion of link introduced in our previous papers and we discuss some consequences for simplicial measures and sums of function algebras.
Source: http://arxiv.org/abs/math/0406571v1
Arxiv.org
texts

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A lattice version of quantum nonlinear Schrodinger (NLS) equation is considered, which has significantly simple form and fullfils most of the criteria desirable for such lattice variants of field models. Unlike most of the known lattice NLS, the present model belongs to a class which does not exhibit the usual symmetry properties. However this lack of symmetry itself seems to be responsible for the remarkable simplification of the relevant objects in the theory, such as the Lax operator, the...
Source: http://arxiv.org/abs/hep-th/9401066v2
Arxiv.org
texts

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Two-dimensional capacitively coupled radio frequency discharge in methane is simulated by PIC-MCC method. The results were obtained in pressure range 50-300 mTorr and voltage range 40-180 V for discharge frequency 13.56 MHz. The electron energy and electron--methane reaction rates spatial distributions show existence of two regimes of discharge glow: a) with active sheaths, when electrons are hot in electrode sheaths and cold in the middle of discharge so the electron-neutral reactions strongly...
Source: http://arxiv.org/abs/physics/0406047v1
Arxiv.org
by A M Cooper-Sarkar
texts

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The PDF4LHC group has benchmarked six modern PDF sets and used them to make predictions for W,Z and Higgs production at the LHC. The reasons why predictions differ are examined and recent updates to the PDFs and their predictions are presented
Source: http://arxiv.org/abs/1107.5170v1
Arxiv.org
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Prior to the epoch of full reionization, the intergalactic medium and gravitationally collapsed systems will be detectable in 21-cm radiation. Physical mechanisms that would produce a 21-cm signature are discussed. These include Lya coupling of the hydrogen spin temperature to the kinetic temperature of the gas resulting from the radiation by an early generation of stars, preheating by soft x-rays from collapsing dark matter halos, and preheating by ambient Lya photons. A patchwork of either...
Source: http://arxiv.org/abs/astro-ph/9902384v1
Afghan Media Resource Center
by A Muj
audio

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Recitation of Holy Quran (00:00:00)
Afghan Media Resource Center
by A Muj Physician
audio

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He is talking about his Jihad against Soviet Army and Kabul Regime troops in Arghandab district of Kandahar and murder of Kabul regime troops by Soviet Army (00:00:00)
Arxiv.org
by A Müller; S Schippers; R. A. Phaneuf; A. L. D. Kilcoyne; H. Bräuning; A. S. Schlachter; M. Lu; B. M. McLaughlin
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High-resolution photoionization experiments were carried out using beams of Be-like C$^{2+}$, N$^{3+}$, and O$^{4+}$ ions with roughly equal populations of the $^1$S ground-state and the $^3$P$^o$ manifold of metastable components. The energy scales of the experiments are calibrated with uncertainties of 1 to 10 meV depending on photon energy. Resolving powers beyond 20,000 were reached allowing for the separation of contributions from the individual metastable $^3$P$^o_0$, $^3$P$^o_1$, and...
Source: http://arxiv.org/abs/1203.6533v1
Arxiv.org
by A Müller; S. Schippers; R. A. Phaneuf; S. W. J. Scully.; A. Aguilar; A. M. Covington; I. Álvarez; C Cisneros; E. D. Emmons; M. F. Gharaibeh; G. Hinojosa; A S. Schlachter; B. M. McLaughlin
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Absolute cross sections for the K-shell photoionization of ground-state Li-like carbon [C$^{3+}$(1s$^2$2s $^2$S)] ions were measured by employing the ion-photon merged-beams technique at the Advanced Light Source. The energy ranges 299.8--300.15 eV, 303.29--303.58 eV and 335.61--337.57 eV of the [1s(2s2p)$^3$P]$^2$P, [1s(2s2p)$^1$P]$^2$P and [(1s2s)$^3$S 3p]$^2$P resonances, respectively, were investigated using resolving powers of up to 6000. The autoionization linewidth of the...
Source: http://arxiv.org/abs/1203.5441v1
Arxiv.org
by A R Dixon; Z L Yuan; J F Dynes; A W Sharpe; A J Shields
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We demonstrate a quantum key distribution with a secure bit rate exceeding 1 Mbit/s over 50 km fiber averaged over a continuous 36-hours period. Continuous operation of high bit rates is achieved using feedback systems to control path length difference and polarization in the interferometer and the timing of the detection windows. High bit rates and continuous operation allows finite key size effects to be strongly reduced, achieving a key extraction efficiency of 96% compared to keys of...
Source: http://arxiv.org/abs/1005.4573v1
Afghan Media Resource Center
audio

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Translating Qazi Abdul Rahim Keshki's speech into English (00:27:18)
Afghan Media Resource Center
by A prisoner in Pul-i-Charkhi prison of Kabul Regime
audio

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He is explaining that how, when and where he was captured by Kabul Regime and his past time in Kabul Regime prison (00:17:36)
Afghan Media Resource Center
by A released prisoner
audio

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He is talking about the reason of his imprisonment by Kabul Regime, National Reconciliation and Ceasefire programs of Kabul Regime, condition of the prisoners in the Kabul Regime's prison, surrender of a Muj to the government and his migration to Pakistan (00:00:00)
Afghan Media Resource Center
by A teacher
audio

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He is talking about education and talking about school needs (00:18:28)
Arxiv.org
by A-M. Stobbart; T. P. Roberts; R. S. Warwick
texts

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We present an analysis of the X-ray properties of the Magellanic-type galaxy NGC 55 based on two contiguous XMM-Newton observations. We detect a total of 137 X-ray sources in the field of view, 42 of which are located within the optical confines of the galaxy. On the basis of X-ray colour classification and after correcting for background objects, we conclude that our source sample includes ~ 20 X-ray binaries, 5 supernova remnants and 7 very soft sources (including 2 good candidate supersoft...
Source: http://arxiv.org/abs/astro-ph/0604589v1
Arxiv.org
by A-Ran Lyo; Inseok Song; Warrick A. Lawson; M. S. Bessell; B. Zuckerman
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We report the outcome of the deep optical/infrared photometric survey of the central region (33 X 33 arcmin or 0.9 pc^2) of the eta Chamaeleontis pre-main sequence star cluster. The completeness limits of the photometry are I = 19.1, J = 18.2 and H = 17.6; faint enough to reveal low mass members down to the brown dwarf and planet boundary of ~ 13 M_Jup. We found no such low mass members in this region. Our result combined with a previous shallower (I = 17) but larger area survey indicates that...
Source: http://arxiv.org/abs/astro-ph/0604054v1
Arxiv.org
by A. -L. Maire; R. Galicher; A. Boccaletti; P. Baudoz; J. Schneider; K. L. Cahoy; D. M. Stam; W. A. Traub
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Context. High-contrast imaging is currently the only available technique for the study of the thermodynamical and compositional properties of exoplanets in long-period orbits. The SPICES project is a coronagraphic space telescope dedicated to the spectro-polarimetric analysis of gaseous and icy giant planets as well as super-Earths at visible wavelengths. So far, studies for high-contrast imaging instruments have mainly focused on technical feasibility because of the challenging planet/star...
Source: http://arxiv.org/abs/1203.2826v1
Arxiv.org
by A. -M. Lagrange; N. Meunier; G. Chauvin; M. Sterzik; F. Galland; G. Lo Curto; J. Rameau; D. Sosnowska
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Stars in young nearby associations are the only targets allowing giant planet searches at all separations in the near future, by coupling indirect techniques such as radial velocity and deep imaging. These stars are first priorities targets for the forthcoming planets imagers on 10-m class telescopes. Young stars rotate more rapidly and are more active than their older counterparts. Both effects can limit the capability to detect planets using RV. We wish to explore the planet detection...
Source: http://arxiv.org/abs/1304.5505v2
Arxiv.org
by A. -M. Nili; U. Yu; J. Moreno; D. Browne; M. Jarrell
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The magneto-optical properties of the ferromagnetic semiconductor Ga$_{1-x}$Mn$_{x}$As are studied within the dynamical mean-field approximation (DMFA). A material-specific multiband $sp^{3}$ tight-binding Hamiltonian is employed for the dispersion of the GaAs host. The calculated density of states shows an impurity band and a distorted valence band for large and moderate values of magnetic coupling, respectively. Upon using the more realistic band structure, the ferromagnetic transition...
Source: http://arxiv.org/abs/1007.4609v1
Arxiv.org
by A. -M. S. Tremblay
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Even at weak to intermediate coupling, the Hubbard model poses a formidable challenge. In two dimensions in particular, standard methods such as the Random Phase Approximation are no longer valid since they predict a finite temperature antiferromagnetic phase transition prohibited by the Mermin-Wagner theorem. The Two-Particle-Self-Consistent (TPSC) approach satisfies that theorem as well as particle conservation, the Pauli principle, the local moment and local charge sum rules. The self-energy...
Source: http://arxiv.org/abs/1107.1534v2
Arxiv.org
by A. -M. Uimonen; E. Khosravi; A. Stan; G. Stefanucci; S. Kurth; R. van Leeuwen; E. K. U. Gross
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We study time-dependent electron transport through an Anderson model. The electronic interactions on the impurity site are included via the self-energy approximations at Hartree-Fock (HF), second Born (2B), GW, and T-Matrix level as well as within a time-dependent density functional (TDDFT) scheme based on the adiabatic Bethe-Ansatz local density approximation (ABALDA) for the exchange correlation potential. The Anderson model is driven out of equilibrium by applying a bias to the leads and its...
Source: http://arxiv.org/abs/1107.0162v2
Arxiv.org
by A. -S. F. Obada; D. A. M. Abo-Kahla; N. Metwally; M. Abdel-Aty
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The speed of computations is investigated by means of the orthogonality speed for a charged qubit interacting with a single cavity field prepared initially in a Fock state or Binomial state. We observe that the rate of the computational speed is related to the number of photons inside the cavity. Moreover, we show that the qubit-field coupling plays an opposite role, where the speed of computations is decreased as the coupling is increased. We suggest using the number of photons in the field as...
Source: http://arxiv.org/abs/1107.1781v1
Arxiv.org
texts

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Assuming that giant planets are formed in thin protoplanetary discs, a '3D' system can form, provided that the mutual inclination is excited by some dynamical mechanism. Resonant interactions and close planetary encounters are thought to be the primary inclination-excitation mechanisms, resulting in a resonant and non-resonant system, respectively. Here we propose an alternative formation scenario, starting from a system composed of three giant planets in a nearly coplanar configuration. As was...
Source: http://arxiv.org/abs/1203.2955v1
Arxiv.org
by A. -S. Libert; K. Tsiganis
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We study the establishment of three-planet resonances -similar to the Laplace resonance in the Galilean satellites- and their effects on the mutual inclinations of the orbital planes of the planets, assuming that the latter undergo migration in a gaseous disc. In particular, we examine the resonance relations that occur, by varying the physical and initial orbital parameters of the planets (mass, initial semi-major axis and eccentricity) as well as the parameters of the migration forces...
Source: http://arxiv.org/abs/1203.2960v1
Arxiv.org
texts

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We study the dynamics of the 3-D three-body problem of a small body moving under the attractions of a star and a giant planet which orbits the star on a much wider and elliptic orbit. In particular, we focus on the influence of an eccentric orbit of the outer perturber on the dynamics of a small highly inclined inner body. Our analytical study of the secular perturbations relies on the classical octupole hamiltonian expansion (third-order theory in the ratio of the semi-major axes), as...
Source: http://arxiv.org/abs/1203.2849v1
Arxiv.org
by A. -S. Ruetschi; D. Jaccard
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The advantage of Bridgman anvil pressure cells is their wide pressure range and the large number of wires which can be introduced into the pressure chamber. In these pressure cells soft solid pressure mediums like steatite are used. We have succeeded in adapting the Bridgman cell to liquid pressure mediums. With this breakthrough it is now possible to measure in very good hydrostatic pressure conditions up to 7 GPa, which is about twice the pressure attainable in piston-cylinder cells. The...
Source: http://arxiv.org/abs/0807.4137v1
Arxiv.org
by A. A. Abdo; K. S. Wood; M. E. DeCesar; F. Gargano; F. Giordano; P. S. Ray; D. Parent; A. K. Harding; M. Coleman Miller; D. L. Wood; M. T. Wolff
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One of the main results of the Fermi Gamma-Ray Space Telescope is the discovery of {\gamma}-ray selected pulsars. The high magnetic field pulsar, PSR J0007+7303 in CTA1, was the first ever to be discovered through its {\gamma}-ray pulsations. Based on analysis of 2 years of LAT survey data, we report on the discovery of {\gamma}-ray emission in the off-pulse phase interval at the ~ 6{\sigma} level. The flux from this emission in the energy range E \geq 100 MeV is F_100 =...
Source: http://arxiv.org/abs/1107.4151v1
Arxiv.org
by A. A. Abdumalikov; J. M. Fink; K. Juliusson; M. Pechal; S. Berger; A. Wallraff; S. Filipp
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The geometric aspects of quantum mechanics are underlined most prominently by the concept of geometric phases, which are acquired whenever a quantum system evolves along a closed path in Hilbert space. The geometric phase is determined only by the shape of this path and is -- in its simplest form -- a real number. However, if the system contains degenerate energy levels, matrix-valued geometric phases, termed non-abelian holonomies, can emerge. They play an important role for the creation of...
Source: http://arxiv.org/abs/1304.5186v1
Arxiv.org
by A. A. Abrikosov Jr
texts

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The 'tHooft's 5N-parametric multiinstanton solution is generalized to curvilinear coordinates. Expressions can be simplified by a gauge transformation that makes $\eta$-symbols constant in the vierbein formalism. This generates the compensating addition to the gauge potential of pseudoparticles. Typical examples (4-spherical, 2+2- and 3+1-cylindrical coordinates) are studied and explicit formulae presented for reference. Singularities of the compensating field are discussed. They are irrelevant...
Source: http://arxiv.org/abs/hep-th/9906008v1
Arxiv.org
by A. A. Abrikosov Jr
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The explicit multi-instanton solutions by 'tHooft and Jackiw, Nohl & Rebbi are generalized to curvilinear coordinates. The idea is that a gauge transformation can notably simplify the expressions obtained after the change of variables. The gauge transform generates a compensating addition to the gauge potential of pseudoparticles. Singularities of the compensating field are irrelevant for physics but may affect gauge dependent quantities.
Source: http://arxiv.org/abs/hep-th/0009114v1
Arxiv.org
by A. A. Abrikosov Jr; E. Gozzi; D. Mauro
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Dequantization is a set of rules which turn quantum mechanics (QM) into classical mechanics (CM). It is not the WKB limit of QM. In this paper we show that, by extending time to a 3-dimensional "supertime", we can dequantize the system in the sense of turning the Feynman path integral version of QM into the functional counterpart of the Koopman-von Neumann operatorial approach to CM. Somehow this procedure is the inverse of geometric quantization and we present it in three different...
Source: http://arxiv.org/abs/quant-ph/0406028v1
Arxiv.org
by A. A. Abrikosov; jr.; D. V. Livanov; A. A. Varlamov
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We develop a general approach to calculations of the electron spectrum of metallic multi-wall carbon nanotubes (MWNT) with arbitrary number of coaxial layers. It is based on the model with singular attractive potential of equidistant conductive cylinders. The knowledge of one-electron spectrum allows to construct the corresponding Green function and then to calculate the entropy and density of states for MWNT. We analyze the tunnelling between the nanotube and normal metal electrode. The...
Source: http://arxiv.org/abs/cond-mat/0406330v1
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by A. A. Aczel; D. E. Bugaris; J. Yeon; C. de la Cruz; H. -C. zur Loye; S. E. Nagler
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We present a neutron powder diffraction study of the monoclinic double perovskite systems Nd2NaB'O6 (B' = Ru, Os), with magnetic atoms occupying both the A and B' sites. Our measurements reveal coupled spin ordering between the Nd and B' atoms with magnetic transition temperatures of 14 K for Nd2NaRuO6 and 16 K for Nd2NaOsO6. There is a Type I antiferromagnetic structure associated with the Ru and Os sublattices, with the ferromagnetic planes stacked along the c-axis and [110] direction...
Source: http://arxiv.org/abs/1304.6687v1
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by A. A. Aczel; E. Baggio-Saitovitch; S. L. Budko; P. C. Canfield; J. P. Carlo; G. F. Chen; Pengcheng Dai; T. Goko; W. Z. Hu; G. M. Luke; J. L. Luo; N. Ni; D. R. Sanchez-Candela; F. F. Tafti; N. L. Wang; T. J. Williams; W. Yu; Y. J. Uemura
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Zero-field (ZF) muon spin relaxation ($\mu$SR) measurements have revealed static commensurate magnetic order of Fe moments in NdOFeAs below $T_{N} \sim 135$ K, with the ordered moment size nearly equal to that in LaOFeAs, and confirmed similar behavior in BaFe$_{2}$As$_{2}$. In single crystals of superconducting (Ba$_{0.55}$K$_{0.45}$)Fe$_{2}$As$_{2}$, $\mu$SR spectra indicate static magnetism with incommensurate or short-ranged spin structure in $\sim$ 70 % of volume below $T_{N} \sim$ 80 K,...
Source: http://arxiv.org/abs/0807.1044v1
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We study the dependence of the magnetization M with magnetic field B at zero temperature in the spin-1/2 XXZ chain with nearest-neighbor (NN) J1 and next-NN J2 exchange interactions, with anisotropies Delta1 and Delta2 respectively. The region of parameters for which a jump in M(B) exists is studied using numerical diagonalization, and analytical results for two magnons on a ferromagnetic background in the thermodynamic limit. We find a line in the parameter space (J2/J1, Delta1/J1, Delta2/J2)...
Source: http://arxiv.org/abs/cond-mat/0009175v1
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by A. A. Aligia; K. Hallberg; B. Normand; A. P. Kampf
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We analyze the phase transitions of an interacting electronic system weakly coupled to free-electron leads by considering its zero-bias conductance. This is expressed in terms of two effective impurity models for the cases with and without spin degeneracy. We demonstrate using the half-filled ionic Hubbard ring that the weight of the first conductance peak as a function of external flux or of the difference in gate voltages between even and odd sites allows one to identify the topological...
Source: http://arxiv.org/abs/cond-mat/0406355v1
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by A. A. Aligia; K. Hallberg; C. D. Batista; G. Ortiz
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We determine the quantum phase diagram of the Hubbard chain with electron-hole symmetric correlated hopping at 1/2- and 1/4-filling using geometric concepts and continuum limit field theory. The long distance behavior of various correlation functions show a very rich phase diagram with several insulating, metallic, and superconducting phases, which might be relevant to (TMTSF)$_2$X compounds. The closing of charge and spin gaps are accurately resolved as topological transitions (jumps in $\pi$...
Source: http://arxiv.org/abs/cond-mat/9910180v1
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We present the third-order contributions to the quark-gluon and gluon-quark timelike splitting functions for the evolution of fragmentation functions in perturbative QCD. These quantities have been derived by studying physical evolution kernels for photon- and Higgs-exchange structure functions in deep inelastic scattering and their counterparts in semi-inclusive annihilation, together with constraints from the momentum sum rule and the supersymmetric limit. For this purpose we have also...
Source: http://arxiv.org/abs/1107.2263v1
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by A. A. Andrianov; D. Espriu
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We extend our previous formulation of low-energy QCD in terms of an effective lagrangian containing operators of dimensionality $d\le 6$ constructed with pseudoscalars and quark fields, describing physics below the scale of chiral symmetry breaking. We include in this paper the vector and axial-vector channels. We follow closely the Extended Chiral Quark Model approach and consistently work in the large-$N_c$ and leading log approximation and take into account the constraints from chiral...
Source: http://arxiv.org/abs/hep-ph/9906459v3
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by A. A. Andrianov; F. Cannata; A. Y. Kamenshchik
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Motivated by the generalization of quantum theory for the case of non-Hermitian Hamiltonians with PT symmetry, we show how a classical cosmological model describes a smooth transition from ordinary dark energy to the phantom one. The model is based on a classical complex Lagrangian of a scalar field. Specific symmetry properties analogous to PT in non-Hermitian quantum mechanics lead to purely real equation of motion.
Source: http://arxiv.org/abs/gr-qc/0604126v2
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by A. A. Andrianov; V. A. Andrianov; D. Espriu; R. Tarrach
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The effective quark models are employed to describe the hadronization of QCD in the quark sector. They reveal a different structure depending on how the spontaneous chiral symmetry breaking (CSB) is implemented. When the generation of light pseudoscalar mesons is manifestly incorporated one deals with an extension of the chiral quark model (CQM) with the non-linear realization of chiral symmetry. If a model is built at the CSB scale by means of perturbation theory it generalizes the...
Source: http://arxiv.org/abs/hep-ph/0009199v1
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by A. A. Apolonsky; S. A. Babin; S. I. Kablukov; R. V. Markov; A. I. Plekhanov; A. M. Shalagin
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A new method is proposed to produce population inversion on transitions involving the ground state of atoms. The method is realized experimentally with sodium atoms. Lasing at the frequency corresponding to the sodium D_2 line is achieved in the presence of pump radiation resonant to the D_1 line with helium as a buffer gas.
Source: http://arxiv.org/abs/physics/9906036v1
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by A. A. Ashimova; S. R. Slabospitsky
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Using the constraint on the single top production cross-section obtained at the HERA collider, $\sigma(ep \to e t X)$, we evaluate an upper limit on oupling constant of the anomalous top quark interaction with a gluon via flavor-changing neutral current: $|\kappa_{tgq}/\Lambda| \le 0.4 {TeV}^{-1}$, BR$(t \to gq) < 13 % $
Source: http://arxiv.org/abs/hep-ph/0604119v3
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We discuss four-fermion contact-interaction searches in the processes e^+e^-\to\mu^+\mu^-, c{\bar c} and b{\bar b} at a future e^+e^- Linear Collider with c.m. energy \sqrt{s}=0.5 TeV and with both beams longitudinally polarized. Our analysis is based on the measurements of familiar polarized observables such as the total cross section and the forward-backward/left-right asymmetries, and accounts for the general set of contact interaction couplings as independent, non-zero, parameters thus...
Source: http://arxiv.org/abs/hep-ph/0107159v1
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by A. A. Babich; P. Osland; A. A. Pankov; N. Paver
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For the processes e+e-\to \mu+\mu-, \tau+\tau-, b\bar{b} and c\bar{c} at a future e+e- collider with \sqrt{s}=0.5 TeV, we examine the sensitivity of the helicity cross sections to four-fermion contact interactions. If longitudinal polarization of the electron beam were available, two polarized integrated cross sections would offer the opportunity to separate the helicity cross sections and, in this way, to derive model-independent bounds on the relevant parameters. The measurement of these...
Source: http://arxiv.org/abs/hep-ph/9910403v2
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by A. A. Balinsky; Yu. Burman
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Quadratic Poisson brackets on a vector space equipped with a bilinear multiplication are studied. A notion of a bracket compatible with the multiplication is introduced and an effective criterion of such compatibility is given. Among compatible brackets, a subclass of coboundary brackets is described, and such brackets are enumerated in a number of examples.
Source: http://arxiv.org/abs/hep-th/9407041v2
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We have calculated the Bardeen-Stephen contribution to the vortex viscosity for uniaxial anisotropic superconductors within the time-dependent Ginzburg-Landau (TDGL) theory. We focus our attention on superconductors with a mismatch of anisotropy of normal and superconducting characteristics. Exact asymptotics for the Bardeen-Stephen contribution have been derived in two limits: the cases of small and large electric field penetration depth (as compared to the coherence length). Also we suggest a...
Source: http://arxiv.org/abs/1203.0459v2
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by A. A. Bhorkar; T. Javidi; A. C. Snoeren
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This paper reports on the first systematic study of congestion-aware routing algorithms for wireless mesh networks to achieve an improved end-end delay performance. In particular, we compare 802.11 compatible implementations of a set of congestion-aware routing protocols against our implementation of state of the art shortest path routing protocol (SRCR). We implement congestion-aware routing algorithms Backpressure (BP), Enhanced-Backpressure (E-BP) adapted from [1], [2] suitably adjusted for...
Source: http://arxiv.org/abs/1203.4841v1
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by A. A. Blinova; M. G. Boshier; Eddy Timmermans
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Polarons, self-localized composite objects formed by the interaction of a single impurity particle with a host medium, are a paradigm of strong interaction many-body physics. We show that dilute gas Bose-Einstein condensates (BEC's) are the first medium known to self-localize the same impurity particles both in a Landau-Pekar polaron state akin to that of self-localized electrons in a dielectric lattice, and in a bubble state akin to that of electron bubbles in helium. We also show that the...
Source: http://arxiv.org/abs/1304.7704v1
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by A. A. Bogush; V. V. Kisel; N. G. Tokarevskaya; V. M. Red'kov
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20-component Petras theory of 1/2-spin particle with anomalous magnetic momentum in presence of external electromagnetic and gravitational fields is investigated. The gravitation field is described as space-time curvature. Correctness of the constructed equations in the sense of general relativity and gauge local Lorentz symmetry is proved in detail. Tetrad P-symmetry of the equations is demonstrated. A generally covariant representation of the invariant bilinear form matrix is established and...
Source: http://arxiv.org/abs/hep-th/0604109v2
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by A. A. Broyles
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Wave functions are generally written with arguments consisting of sets of ``particle'' coordinates and quantum numbers. Pauli derived a principle governing the exchange of pairs of sets that differ only in their spatial and spin component $(m_s)$ coordinates. This principle states that an exchange of two of these sets produces the same wave function except for its being multiplied by a factor of $(-1)^{2s}$. Pauli's proof is based upon quantum field operators and is difficult to understand. A...
Source: http://arxiv.org/abs/quant-ph/9906046v1
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by A. A. Bruen; J. W. P. Hirschfeld; D. L. Wehlau
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Some geometry on non-singular cubic curves, mainly over finite fields, is surveyed. Such a curve has 9,3,1 or 0 points of inflexion, and cubic curves are classified accordingly. The group structure and the possible numbers of rational points are also surveyed. A possible strengthening of the security of elliptic curve cryptography is proposed using a `shared secret' related to the group law. Cubic curves are also used in a new way to construct sets of points having various combinatorial and...
Source: http://arxiv.org/abs/1107.4387v1
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by A. A. Burkov; D. G. Hawthorn
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We derive diffusion equations, which describe spin-charge coupled transport on the helical metal surface of a three-dimensional topological insulator. The main feature of these equations is a large magnitude of the spin-charge coupling, which leads to interesting and observable effects. In particular, we predict a new magnetoresistance effect, which manifests in a nonohmic correction to a voltage drop between a ferromagnetic spin-polarized electrode and a nonmagnetic electrode, placed on top of...
Source: http://arxiv.org/abs/1005.1654v3
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by A. A. Bush; N. Büttgen; A. A. Gippius; V. N. Glazkov; W. Kraetschmer; L. A. Prozorova; L. E. Svistov; A. M. Vasiliev; A. Zheludev; A. M. Farutin
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We present the results of magnetization, ESR and NMR measurements on single crystal samples of the frustrated S=1/2 chain cuprate LiCu2O2 doped with nonmagnetic Zn^2+. As shown by the x-ray techniques the crystals of Li(Cu{1-x}Zn{x})2O2 with x
Source: http://arxiv.org/abs/1304.4728v2
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by A. A. Bylinkin; A. A. Rostovtsev
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The shapes of invariant differential cross section for identified pi,K, p and pbar production as function of transverse momentum measured in pp collisions by the PHENIX detector are analyzed. Simultaneous fit of these data to the sum of exponential and power-law terms show significant difference in the exponential term contributions. This effect qualitatively explains the observed shape of the experimental K/pi and p/pi yield ratios measured as function of transverse momentum of produced...
Source: http://arxiv.org/abs/1203.2840v1
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Algebraic aspects of the computation of partition functions for quantum gravity and black holes in $AdS_3$ are discussed. We compute the sub-leading quantum corrections to the Bekenstein-Hawking entropy. It is shown that the quantum corrections to the classical result can be included systematically by making use of the comparison with conformal field theory partition functions, via the $AdS_3/CFT_2$ correspondence. This leads to a better understanding of the role of modular and spectral...
Source: http://arxiv.org/abs/1304.7021v1
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by A. A. Bytsenko; E. Elizalde; S. D. Odintsov; S. Zerbini
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A novel representation ---in terms of a Laurent series--- for the free energy of string theory at non-zero temperature is constructed. The examples of open bosonic, open supersymmetric and closed bosonic strings are studied in detail. In all these cases the Laurent series representation for the free energy is obtained explicitly. It is shown that the Hagedorn temperature arises in this formalism as the convergence condition (specifically, the radius of convergence) of the corresponding Laurent...
Source: http://arxiv.org/abs/hep-th/9210085v1
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by A. A. Bytsenko; F. L. Williams
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We present a brief introduction to the Berline-Vergne localization formula which expresses the integral of an equivariant cohomology class as a sum over zeros of a vector field to which that class is related.
Source: http://arxiv.org/abs/hep-th/0009238v1
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by A. A. Bytsenko; L. Vanzo; S. Zerbini
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The invariant integration method for Chern-Simons theory defined on the compact hyperbolic manifold {\Gamma}\H^3 is verified in the semiclassical approximation. The semiclassical limit for the partition function is presented. We discuss briefly L^2 - analytic torsion and the eta invariant of Atiyah-Patodi-Singer for compact hyperbolic 3-manifolds.
Source: http://arxiv.org/abs/hep-th/9906092v1
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by A. A. Bytsenko; M. E. X. Guimaraes
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We analyze aspects of the holographic principle relevant to the quantum gravity partition functions in Euclidean sector of AdS$_3$. The sum of the known contributions to the partitions functions can be presented exactly, including corrections, in the form where the Patterson-Selberg zeta function involves.
Source: http://arxiv.org/abs/0807.2222v5
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The Vicsek model for the self-propelled particles is investigated with the respect to the introduction of the stochastic perturbation of the dynamics. It is shown that such a dependence can be thought in terms of the isomorphism of the Vicsek model with the Kuramoto model of spontaneous synchronization. They are isomorphic at least within the mean-field approach. The isomorphism between two models allows to state the dependence of the type of the transition in Vicsek model on the noise...
Source: http://arxiv.org/abs/1005.2140v3
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Using standard linear response relations, we derive the quantum limit on the sensitivity of a generic linear-response position detector, and the noise temperature of a generic linear amplifier. Particular emphasis is placed on the detector's effective temperature and damping effects; the former quantity directly determines the dimensionless power gain of the detector. Unlike the approach used in the seminal work of Caves [Phys. Rev. D, 26, 1817 (1982)], the linear-response approach directly...
Source: http://arxiv.org/abs/cond-mat/0406536v2
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The qualitative properties of spatially homogeneous stiff perfect fluid and minimally coupled massless scalar field models within general relativity are discussed. Consequently, by exploiting the formal equivalence under conformal transformations and field redefinitions of certain classes of theories of gravity, the asymptotic properties of spatially homogeneous models in a class of scalar-tensor theories of gravity that includes the Brans-Dicke theory can be determined. For example, exact...
Source: http://arxiv.org/abs/astro-ph/9910395v1
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by A. A. Coley
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Dynamical systems theory is especially well-suited for determining the possible asymptotic states (at both early and late times) of cosmological models, particularly when the governing equations are a finite system of autonomous ordinary differential equations. We begin with a brief review of dynamical systems theory. We then discuss cosmological models as dynamical systems and point out the important role of self-similar models. We review the asymptotic properties of spatially homogeneous...
Source: http://arxiv.org/abs/gr-qc/9910074v1
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by A. A. Darmohval; V. K. Petrov; G. M. Zinovjev
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The potential between sources in arbitrary representations of the gauge group is studied on an anisotropic lattice in a spherical model approximation. It is shown analytically that for half-integer $j$ and $j'$ in the confinement phase the potential rises linearly, whereas for integer $j$ and half-integer $j'$ it rises infinitely which means a strong suppression of the combination of such states . For integer $j$ and $j'$ the potential shows Debay screening and Coulomb behavior in the...
Source: http://arxiv.org/abs/hep-lat/9906003v2
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Bosonic model inspired by D=11 superstring action is investigated. An appropriate set of variables is find, in which the light-cone quantization turns out to be possible. It is shown that anomaly terms in the algebra of the light-cone Poincare generators are absent for the case D=27.
Source: http://arxiv.org/abs/hep-th/0009078v1
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We propose a relativistic particle model without Grassmann variables which, being canonically quantized, leads to the Dirac equation. Both $\Gamma$\,-matrices and the relativistic spin tensor are produced through the canonical quantization of the classical variables which parametrize the properly constructed relativistic spin surface. Although there is no mass-shell constraint in our model, our particle's speed cannot exceed the speed of light. The classical dynamics of the model is in...
Source: http://arxiv.org/abs/1107.0273v4
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We construct a non-Grassmann spinning-particle model which, by analogy with quantum mechanics, does not admit the notion of a trajectory within the position space. The pseudo-classical character of the model allows us to avoid the inconsistencies arising in the quantum-mechanical interpretation of a one-particle sector of the Dirac equation.
Source: http://arxiv.org/abs/1203.5697v3
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by A. A. Deshpande; R. Ramachandran; V. Radhakrishnan
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We examine available observations on pulsars for evidence pertaining to mechanisms proposed to explain the origin of their velocities. We find that mechanisms predicting a correlation between the rotation axis and the pulsar velocity are ruled out. Also, that there is no significant correlation between pulsar magnetic field strengths and velocities. With respect to recent suggestions postulating asymmetric impulses at birth being solely responsible for both the spins and velocities of pulsars,...
Source: http://arxiv.org/abs/astro-ph/9910103v1
We prove a theorem on self-improving regularity for derivatives of solutions of the inequality $F(v'(x))\le KG(v'(x))$ constructed by means of a quasiconvex function $F$ and a null Lagrangian $G$. We apply this theorem to improve the stability and H\"older regularity results of \cite{Egor2008} and to establish a theorem on removability of singularities for solutions of this inequality.
Source: http://arxiv.org/abs/1005.3459v1
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by A. A. Fernandez-Marin; J. A. Mendez-Bermudez; Victor A. Gopar
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We study the electromagnetic transmission $T$ through one-dimensional (1D) photonic heterostructures whose random layer thicknesses follow a long-tailed distribution --L\'evy-type distribution. Based on recent predictions made for 1D coherent transport with L\'evy-type disorder, we show numerically that for a system of length $L$ (i) the average $ \propto L^\alpha$ for $0
Source: http://arxiv.org/abs/1203.1337v1
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by A. A. Galeev A. M. Sadovski
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Axford and McKenzie [1992] suggested that the energy released in impulsive reconnection events generates high frequency Alfv\'en waves. The kinetic equation for spectral energy density of waves is derived in the random phase approximation. Solving this equation we find the wave spectrum with the power law ``-1'' in the low frequency range which is matched to the spectrum above the spectral brake with the power low ``-1.6.'' The heating rate of solar wind protons due to the dissipation of...
Source: http://arxiv.org/abs/physics/9902015v1
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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