cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fractional quantum Hall states of a Bose gas with spin-orbit coupling
Creators: name: Grass, T.
name: Juliá-Díaz, B.
name: Burrello, M.
name: Lewenstein, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the fractional quantum Hall phases of a pseudospin-1/2 Bose gas in an artificial gauge field. In addition to an external magnetic field, the gauge field also mimics an intrinsic spin-orbit coupling of the Rashba type. While the spin degeneracy of the Landau levels is lifted by the spin-orbit coupling, the crossing of two Landau levels at certain coupling strengths gives rise to a new degeneracy. We therefore take into account two Landau levels, and perform exact diagonalization of the many-body Hamiltonian. We study and characterize the quantum Hall phases which occur in the vicinity of the degeneracy point. Notably, we describe the different states appearing at the Laughlin filling, ν=1/2. While for this filling incompressible phases disappear at the degeneracy point, denser systems at ν=3/2 and ν=2 are found to be clearly gapped. For filling factors ν=2/3 and ν=4/3, we discuss the connection of the exact ground state to the non-Abelian spin singlet states, obtained as the ground state of k+1 body contact interactions.
Opening the window to the cogenesis with Affleck-Dine mechanism in gravity mediation
Creators: name: Kamada, Ayuki
name: Kawasaki, Masahiro
name: Yamada, Masaki
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The observed baryon and dark matter densities are equal up to a factor of 5. This observation indicates that the baryon asymmetry and dark matter have the same origin. The Affleck-Dine baryogenesis is one of the most promising mechanisms in this context. Q balls, which are often formed in the early Universe associated with the Affleck-Dine baryogenesis, decay both into supersymmetric particles and into quarks. Recently, it was pointed out that annihilation of squarks into quarks gives a dominant contribution to the Q-ball decay rate and the branching ratio of Q-ball decay into supersymmetric particles changes from the previous estimate. In this paper, the scenario of baryon and dark matter cogenesis from Q ball in gravity mediation is revisited in respect of the improved Q-ball decay rates. It is found that the successful cogenesis takes place when a wino with mass 0.3-1 TeV is dark matter.
description: 5 pages, 3 figures
Mädchen lesen ander(e)s als Jungen. Unterschiedliche Leseinteressen und Leseweisen – Empirische Befunde und Erklärungsansätze
Creators: name: Garbe, Christine
Publisher: name: querelles-net
Year: 2003
Subjects: Jugend; Literatur; Bildung; Geschlecht; Gender

description: querelles-net, Nr. 10 (2003): Kindheit und Jugend
Now is the Time to Scale Up Birth-Dose Hepatitis B Vaccine in Low- and Middle-Income Countries
Creators: name: Wang, Su H
name: Ezechi, Oliver C
name: Thompson, Peyton
name: Razavi-Shearer, Devin
name: Tucker, Joseph D
name: Parr, Jonathan B
name: Boisson, Alix
Publisher: name: Oxford University Press (OUP)
Year: 2023

description:
Fewer than half of the world's infants have access to the birth dose of hepatitis B vaccine (HBV), which prevents mother-to-child transmission of HBV and subsequent liver cancer. Now is the time to expand access for infants born in low-resource settings.
Proof of the area-angular momentum-charge inequality for axisymmetric black holes
Creators: name: Clement, María E. Gabach
name: Jaramillo, José Luis
name: Reiris, Martín
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We give a comprehensive discussion, including a detailed proof, of the area-angular momentum-charge inequality for axisymmetric black holes. We analyze the inequality from several viewpoints, in particular including aspects with a theoretical interest well beyond the Einstein-Maxwell theory.
description: 31 pages, 2 figures
Compton scattering from the proton in an effective field theory with explicit Delta degrees of freedom
Creators: name: McGovern, Judith A.
name: Phillips, Daniel R.
name: Grießhammer, Harald W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We analyse the proton Compton-scattering differential cross section for photon energies up to 325 MeV using Chiral Effective Field Theory and extract new values for the electric and magnetic polarisabilities of the proton. Our EFT treatment builds in the key physics in two different regimes: photon energies around the pion mass ("low energy") and the higher energies where the Delta(1232) resonance plays a key role. The Compton amplitude is complete at N4L0, O(e^2 delta^4), in the low-energy region, and at NLO, O(e^2 delta^0), in the resonance region. Throughout, the Delta-pole graphs are dressed with pi-N loops and gamma-N-Delta vertex corrections. A statistically consistent database of proton Compton experiments is used to constrain the free parameters in our amplitude: the M1 gamma-N-Delta transition strength b_1 (which is fixed in the resonance region) and the polarisabilities alpha and beta (which are fixed from data below 170 MeV). In order to obtain a reasonable fit we find it necessary to add the spin polarisability gammaM1 as a free parameter, even though it is, strictly speaking, predicted in chiral EFT at the order to which we work. We show that the fit is consistent with the Baldin sum rule, and then use that sum rule to constrain alpha+beta. In this way we obtain alpha=[10.65+/-0.35(stat})+/-0.2(Baldin)+/-0.3(theory)]10^{-4} fm^3, and beta =[3.15-/+0.35(stat)-/+0.2(Baldin)-/+0.3(theory)]10^{-4} fm^3, with chi^2 = 113.2 for 135 degrees of freedom. A detailed rationale for the theoretical uncertainties assigned to this result is provided.
description: 36 pages, 15 figures Version 2 is shortened for publication; version 1 is more self-contained. Results section unchanged
Charged current neutrino interactions in core-collapse supernovae in a virial expansion
Creators: name: Horowitz, C. J.
name: Shen, G.
name: O'Connor, Evan
name: Ott, Christian
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Core-collapse supernovae may depend sensitively on charged current neutrino interactions in warm, low density neutron rich matter. A proton in neutron rich matter is more tightly bound than is a neutron. This energy shift ΔU increases the electron energy in ν_e + n --> p + e, increasing the available phase space and absorption cross section. Likewise ΔU decreases the positron energy in \bar ν_e + p --> n + e^+, decreasing the phase space and cross section. We have calculated ΔU using a model independent virial expansion and we find ΔU is much larger, at low densities, than the predictions of many mean field models. Therefore ΔU could have a significant impact on charged current neutrino interactions in supernovae. Preliminary simulations of the accretion phase of core-collapse supernovae find that ΔU increases \bar ν_e energies and decreases the ν_e luminosity.
description: 8 pages, 4 figures, minor corrections, Phys. Rev. C in press
A Riccati differential equation and free subgroup numbers for lifts of $\PSL_2(\Z)$ modulo powers of primes
Creators: name: Krattenthaler, Christian
name: Müller, Thomas W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: Primary 05A15, Secondary 05E99 11A07 20E06 20E07 68W30

description: It is shown that the number $f_λ$ of free subgroups of index $6λ$ in the modular group $\PSL_2(\Z)$, when considered modulo a prime power $p^\al$ with $p\ge5$, is always (ultimately) periodic. In fact, an analogous result is established for a one-parameter family of lifts of the modular group (containing $\PSL_2(\Z)$ as a special case), and for a one-parameter family of lifts of the Hecke group $\mathfrak{H}(4)=C_2*C_4$. All this is achieved by explicitly determining Padé approximants to solutions of a certain multi-parameter family of Riccati differential equations. Our main results complement previous work by Kauers and the authors (arXiv:1107.2015 and ["A method for determining the mod-$3^k$ behaviour of recursive sequences"}, preprint]), where it is shown, among other things, that the free subgroup numbers of $\PSL_2(\Z)$ and its lifts display rather complex behaviour modulo powers of 2 and 3.
description: AmS-LaTeX; 30 pages; superfluous equation number dropped
ProSUM Classification - Harmonization paper
Creators: name: WEEE Forum
Publisher: name: Zenodo
Year: 2017
Subjects: Critical Raw Materials (CRMs)
Urban Mine Knowledge Data Platform
Urban Mine Platform
primary and secondary raw materials

description: ProSUM – Latin for “I am useful” – aims to provide better information on raw materials from secondary origins. It focuses in particular on the content of Critical Raw Materials (CRMs) from Batteries (BATT), Waste Electrical and Electronic Equipment (WEEE), End of Life Vehicles (ELV) and Mining Wastes (MIN) available for processing in Europe. However, data for these products are usually very scattered amongst a variety of institutions, including government agencies, universities, NGOs and industry. This deficit is addressed in this Horizon 2020 funded project. ProSUM will establish a European network of expertise on secondary sources of CRMs, vital to today’s high-tech society. It coordinates efforts to collect secondary CRM data and collate maps of stocks and flows for materials and products in the “urban mine”. The project will construct a comprehensive inventory identifying and mapping CRM stocks and flows across the European Union (EU). Via a user-friendly, open-access Urban Mine Knowledge Data Platform (EU-UMKDP), it will combine and relate them to primary raw materials data from the EU-FP7 Minerals4EU project and communicate the results online through the future European Geological Data Infrastructure (EGDI) at large. It will also provide update protocols, standards and recommendations to maintain and expand the EU-UMKDP in the future.

The ProSUM project delivered the first Urban Mine Knowledge Data Platform, accessible at http://www.urbanmineplatform.eu/, a centralised database of all available data and information on arisings, stocks, flows and treatment of waste electrical and electronic equipment (WEEE), end-of-life vehicles (ELVs), batteries and mining wastes.
Comments on black holes I: The possibility of complementarity
Creators: name: Mathur, Samir D.
name: Turton, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We comment on a recent paper of Almheiri, Marolf, Polchinski and Sully who argue against black hole complementarity based on the claim that an infalling observer 'burns' as he approaches the horizon. We show that in fact measurements made by an infalling observer outside the horizon are statistically identical for the cases of vacuum at the horizon and radiation emerging from a stretched horizon. This forces us to follow the dynamics all the way to the horizon, where we need to know the details of Planck scale physics. We note that in string theory the fuzzball structure of microstates does not give any place to 'continue through' this Planck regime. AMPS argue that interactions near the horizon preclude traditional complementarity. But the conjecture of 'fuzzball complementarity' works in the opposite way: the infalling quantum is absorbed by the fuzzball surface, and it is the resulting dynamics that is conjectured to admit a complementary description.
description: 34 pages, 6 figures, v3: clarifications & references added
Estimates for the thermodynamic signatures of vortex-lattice melting in conventional superconductors
Creators: name: Bossen, Olaf
name: Schilling, Andreas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The first-order nature of the vortex-lattice melting transition in copper-based layered high-Tc superconductors is well established. The associated discontinuities in magnetization have been extensively studied, for example, in YBa2Cu3O7 and Bi2Sr2CaCu2O8, while the respective latent heats have been systematically investigated only in YBa2Cu3O7 and related compounds. The apparent absence of such signatures in conventional superconductors such as Nb raises the question whether or not the concept of vortex-lattice melting is applicable at all in such materials. Based on available literature to describe the vortex-state and using the Lindemann criterion, we estimate quantitatively the order of magnitude for the expected latent heats of melting and the associated discontinuities in magnetization, respectively, as functions of a few known material parameters. It turns out that both thermodynamic quantities are not strictly vanishing even in isotropic materials as long as $κ> 1/\sqrt{2}$, but they are small and may often be beyond the available experimental resolution.
description: 21 pages, 8 figures
Quantum Fluctuations in Holographic Theories with Hyperscaling Violation
Creators: name: Edalati, Mohammad
name: Pedraza, Juan F.
name: Garcia, Walter Tangarife
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In this short note we use holographic methods to study the response of quantum critical points with hyperscaling violation to a disturbance caused by a massive charged particle. We give analytical expressions for the two-point functions of the fluctuations of the massive probe as a function of arbitrary (allowed) values of the hyperscaling violation exponent θ and the dynamical exponent z. We point out the existence of markedly different behaviors of the two-point functions in the parameter space of θ and z at late times. In particular, as expected, the late-time dynamics of the probe becomes independent of its inertial mass in the range z+2θ/d>2.
description: 10 pages. v2: typos corrected and some references added. v3: version to appear in PRD
The complexity of approximating conservative counting CSPs
Creators: name: Chen, Xi
name: Dyer, Martin
name: Goldberg, Leslie Ann
name: Jerrum, Mark
name: Lu, Pinyan
name: McQuillan, Colin
name: Richerby, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences

description: We study the complexity of approximately solving the weighted counting constraint satisfaction problem #CSP(F). In the conservative case, where F contains all unary functions, there is a classification known for the case in which the domain of functions in F is Boolean. In this paper, we give a classification for the more general problem where functions in F have an arbitrary finite domain. We define the notions of weak log-modularity and weak log-supermodularity. We show that if F is weakly log-modular, then #CSP(F)is in FP. Otherwise, it is at least as difficult to approximate as #BIS, the problem of counting independent sets in bipartite graphs. #BIS is complete with respect to approximation-preserving reductions for a logically-defined complexity class #RHPi1, and is believed to be intractable. We further sub-divide the #BIS-hard case. If F is weakly log-supermodular, then we show that #CSP(F) is as easy as a (Boolean) log-supermodular weighted #CSP. Otherwise, we show that it is NP-hard to approximate. Finally, we give a full trichotomy for the arity-2 case, where #CSP(F) is in FP, or is #BIS-equivalent, or is equivalent in difficulty to #SAT, the problem of approximately counting the satisfying assignments of a Boolean formula in conjunctive normal form. We also discuss the algorithmic aspects of our classification.
description: Minor revision
Massively parallel Monte Carlo for many-particle simulations on GPUs
Creators: name: Anderson, Joshua A.
name: Jankowski, Eric
name: Grubb, Thomas L.
name: Engel, Michael
name: Glotzer, Sharon C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Current trends in parallel processors call for the design of efficient massively parallel algorithms for scientific computing. Parallel algorithms for Monte Carlo simulations of thermodynamic ensembles of particles have received little attention because of the inherent serial nature of the statistical sampling. In this paper, we present a massively parallel method that obeys detailed balance and implement it for a system of hard disks on the GPU. We reproduce results of serial high-precision Monte Carlo runs to verify the method. This is a good test case because the hard disk equation of state over the range where the liquid transforms into the solid is particularly sensitive to small deviations away from the balance conditions. On a Tesla K20, our GPU implementation executes over one billion trial moves per second, which is 148 times faster than on a single Intel Xeon E5540 CPU core, enables 27 times better performance per dollar, and cuts energy usage by a factor of 13. With this improved performance we are able to calculate the equation of state for systems of up to one million hard disks. These large system sizes are required in order to probe the nature of the melting transition, which has been debated for the last forty years. In this paper we present the details of our computational method, and discuss the thermodynamics of hard disks separately in a companion paper.
description: 11 pages, 4 figures, 4 tables
The Demographics of Broad Line Quasars in the Mass-Luminosity Plane II. Black Hole Mass and Eddington Ratio Functions
Creators: name: Kelly, Brandon C.
name: Shen, Yue
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We employ a flexible Bayesian technique to estimate the black hole mass and Eddington ratio functions for Type 1 (i.e., broad line) quasars from a uniformly-selected data set of ~58,000 quasars from the SDSS DR7. We find that the SDSS becomes significantly incomplete at M_{BH} < 3 x 10^8 M_{Sun} or L / L_{Edd} < 0.07, and that the number densities of Type 1 quasars continue to increase down to these limits. Both the mass and Eddington ratio functions show evidence of downsizing, with the most massive and highest Eddington ratio black holes experiencing Type 1 quasar phases first, although the Eddington ratio number densities are flat at z < 2. We estimate the maximum Eddington ratio of Type 1 quasars in the observable Universe to be L / L_{Edd} ~ 3. Consistent with our results in Paper I, we do not find statistical evidence for a so-called "sub-Eddington boundary" in the mass-luminosity plane of broad line quasars, and demonstrate that such an apparent boundary in the observed distribution can be caused by selection effect and errors in virial BH mass estimates. Based on the typical Eddington ratio in a given mass bin, we estimate typical growth times for the black holes in Type 1 quasars and find that they are typically comparable to or longer than the age of the universe, implying an earlier phase of accelerated (i.e., with higher Eddington ratios) and possibly obscured growth. The large masses probed by our sample imply that most of our black holes reside in what are locally early type galaxies, and we interpret our results within the context of models of self-regulated black hole growth.
description: Submitted to ApJ, 25 pages (emulateapj), 15 figures; revised to match accepted version with primary changes to the introduction and discussion, replaced Fig 12
Analytical Solution of Metapopulation Dynamics in Stochastic Environment
Creators: name: Morita, Satoru
name: Yoshimura, Jin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We study a stochastic linear discrete metapolulation model to understand the effect of risk spreading by dispersion. We calculate analytically the stable distribution of populations that live in different habitats. The result shows that the simultaneous distribution of the populations has a complicated self-similar structure, but a population at each habitat follows a log-normal distribution.
description: Latex file, 10 pages, 3 figures
Finite-size effects on current correlation functions
Creators: name: Chen, Shunda
name: Zhang, Yong
name: Wang, Jiao
name: Zhao, Hong
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We study why the calculation of current correlation functions (CCFs) still suffers from finite size effects even when the periodic boundary condition is taken. Two important one dimensional, momentum conserving systems are investigated as examples. Intriguingly, it is found that the state of a system recurs in the sense of microcanonical ensemble average, and such recurrence may result in oscillations in CCFs. Meanwhile, we find that the sound mode collisions induce an extra time decay in a current so that its correlation function decays faster (slower) in a smaller (larger) system. Based on these two unveiled mechanisms, a procedure for correctly evaluating the decay rate of a CCF is proposed, with which our analysis suggests that the global energy CCF decays as $\sim t^{-\frac{2}{3}}$ in the diatomic hard-core gas model and in a manner close to $\sim t^{-\frac{1}{2}}$ in the Fermi-Pasta-Ulam-$β$ model.
description: 5 pages,4 figures
Epitaxy-distorted spin-orbit Mott insulator in Sr2IrO4 thin films
Creators: name: Serrao, C. Rayan
name: Liu, Jian
name: Heron, J. T.
name: Singh-Bhalla, G.
name: Yadav, A.
name: Suresha, S. J.
name: Paull, R. J.
name: Yi, D.
name: Chu, J. -H.
name: Trassin, M.
name: Vishwanath, A.
name: Arenholz, E.
name: Frontera, C.
name: Železný, J.
name: Jungwirth, T.
name: Marti, X.
name: Ramesh, R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: High quality epitaxial thin films of Jeff=1/2 Mott insulator Sr2IrO4 with increasing in-plane tensile strain have been grown on top of SrTiO3(001) substrates. Increasing the in-plane tensile strain up to ~0.3% was observed to drop the c/a tetragonality by 1.2 %. X-ray absorption spectroscopy detected a strong reduction of the linear dichroism upon increasing in-plane tensile strain towards a reduced anisotropy in the local electronic structure. While the most relaxed thin film shows a consistent dependence with previously reported single crystal bulk measurements, electrical transport reveals a charge gap reduction from 200 meV down to 50 meV for the thinnest and most epitaxy-distorted film. We argue that the reduced tetragonality plays a major role in the change of the electronic structure, which is reflected in the change of the transport properties. Our work opens the possibility for exploiting epitaxial strain as a tool for both structural and functional manipulation of spin-orbit Mott systems.
Exact integration of height probabilities in the Abelian Sandpile Model
Creators: name: Caracciolo, Sergio
name: Sportiello, Andrea
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: Combinatorics (math.CO)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The height probabilities for the recurrent configurations in the Abelian Sandpile Model on the square lattice have analytic expressions, in terms of multidimensional quadratures. At first, these quantities have been evaluated numerically with high accuracy, and conjectured to be certain cubic rational-coefficient polynomials in 1/pi. Later their values have been determined by different methods. We revert to the direct derivation of these probabilities, by computing analytically the corresponding integrals. Yet another time, we confirm the predictions on the probabilities, and thus, as a corollary, the conjecture on the average height.
description: 17 pages, added references
„Betriebliches Gesundheitsmanagement in diakonischen Einrichtungen
Creators: name: Schweizer, Dorothea
Publisher: name: DWI-Jahrbuch – Diakoniewissenschaft in Forschung und Lehre
Year: 2019

description: DWI-Jahrbuch – Diakoniewissenschaft in Forschung und Lehre, Bd. 46: (2018/2019): Diakoniewissenschaft in Forschung und Lehre
Dynamics of link states in complex networks: The case of a majority rule
Creators: name: Fernández-Gracia, J.
name: Castelló, X.
name: Eguíluz, V. M.
name: Miguel, M. San
Publisher: name: arXiv
Year: 2012
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Motivated by the idea that some characteristics are specific to the relations between individuals and not of the individuals themselves, we study a prototype model for the dynamics of the states of the links in a fixed network of interacting units. Each link in the network can be in one of two equivalent states. A majority link-dynamics rule is implemented, so that in each dynamical step the state of a randomly chosen link is updated to the state of the majority of neighboring links. Nodes can be characterized by a link heterogeneity index, giving a measure of the likelihood of a node to have a link in one of the two states. We consider this link-dynamics model on fully connected networks, square lattices and Erd ös-Renyi random networks. In each case we find and characterize a number of nontrivial asymptotic configurations, as well as some of the mechanisms leading to them and the time evolution of the link heterogeneity index distribution. For a fully connected network and random networks there is a broad distribution of possible asymptotic configurations. Most asymptotic configurations that result from link-dynamics have no counterpart under traditional node dynamics in the same topologies.
description: 9 pages, 13 figures
Gauge Invariant Computable Quantities In Timelike Liouville Theory
Creators: name: Maltz, Jonathan
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Timelike Liouville theory admits the sphere $\mathbb{S}^{2}$ as a real saddle point, about which quantum fluctuations can occur. An issue occurs when computing the expectation values of specific types of quantities, like the distance between points. The problem being that the gauge redundancy of the path integral over metrics is not completely fixed even after fixing to conformal gauge by imposing $g_{μν} = e^{2\bϕ}\tilde{g}_{μν}$, where $ϕ$ is the Liouville field and $\tilde{g}_{μν}$ is a reference metric. The physical metric $g_{μν}$, and therefore the path integral over metrics still possesses a gauge redundancy due to invariance under $SL_{2}(\mathbb{C})$ coordinate transformations of the reference coordinates. This zero mode of the action must be dealt with before a perturbative analysis can be made. This paper shows that after fixing to conformal gauge, the remaining zero mode of the linearized Liouville action due to $SL_{2}(\mathbb{C})$ coordinate transformations can be dealt with by using standard Fadeev-Popov methods. Employing the gauge condition that the "dipole" of the reference coordinate system is a fixed vector, and then integrating over all values of this dipole vector. The "dipole" vector referring to how coordinate area is concentrated about the sphere; assuming the sphere is embedded in $\mathbb{R}^{3}$ and centered at the origin, and the coordinate area is thought of as a charge density on the sphere. The vector points along the ray from the origin of $\mathbb{R}^{3}$ to the direction of greatest coordinate area. A Green's function is obtained and used to compute the expectation value of the geodesic length between two points on the $\mathbb{S}^{2}$ to second order in the Timelike Liouville coupling $\b$. This quantity doesn't suffer from any power law or logarithmic divergences as a naïve power counting argument might suggest.
description: 20 pages, 3 figures, Minor Typos corrected, references added
Approximating the partition function of planar two-state spin systems
Creators: name: Goldberg, Leslie Ann
name: Jerrum, Mark
name: McQuillan, Colin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences
subject: 68Q17, 60C05, 68W25, 82B20

description: We consider the problem of approximating the partition function of the hard-core model on planar graphs of degree at most 4. We show that when the activity lambda is sufficiently large, there is no fully polynomial randomised approximation scheme for evaluating the partition function unless NP=RP. The result extends to a nearby region of the parameter space in a more general two-state spin system with three parameters. We also give a polynomial-time randomised approximation scheme for the logarithm of the partition function.
Induced gravity from gauge theories
Creators: name: Sobreiro, R. F.
name: Tomaz, A. A.
name: Otoya, V. J. Vasquez
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We discuss the possibility of a class of gauge theories, in four Euclidean dimensions, to describe gravity at quantum level. The requirement is that, at low energies, these theories can be identified with gravity as a geometrodynamical theory. Specifically, we deal with de Sitter-type groups and show that a Riemann-Cartan first order gravity emerges. An analogy with quantum chromodynamics is also formulated. Under this analogy it is possible to associate a soft BRST breaking to a continuous deformation between both sectors of the theory, namely, ultraviolet and infrared. Moreover, instead of hadrons and glueballs, the physical observables are identified with the geometric properties of spacetime. Furthermore, Newton and cosmological constants can be determined from the dynamical content of the theory.
description: 17pp. No figures. Talk given at \emph{NEB 15 - Recent Developments in Gravity}, 20-23 June 2012, Technological Educational Institute, Chania, Crete, Greece
Gravity Amplitudes from n-Space
Creators: name: Cheung, Clifford
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We identify a hidden GL(n,C) symmetry of the tree level n-point MHV gravity amplitude. Representations of this symmetry reside in an auxiliary n-space whose indices are external particle labels. Spinor helicity variables transform non-linearly under GL(n,C), but linearly under its notable subgroups, the little group and the permutation group S_n. Using GL(n,C) covariant variables, we present a new and simple formula for the MHV amplitude which can be derived solely from geometric constraints. This expression carries a huge intrinsic redundancy which can be parameterized by a pair of reference 3-planes in n-space. Fixing this redundancy in a particular way, we reproduce the S_{n-3} symmetric form of the MHV amplitude of [1], which is in turn equivalent to the S_{n-2} symmetric form of [2] as a consequence of the matrix tree theorem. The redundancy of the amplitude can also be fixed in a way that fully preserves S_n, yielding new and manifestly S_n symmetric forms of the MHV amplitude. Remarkably, these expressions need not be manifestly homogenous in spinorial weight or mass dimension. We comment on possible extensions to N^{k-2}MHV amplitudes and speculate on the deeper origins of GL(n,C).
description: 11 pages; v2: references added, minor typos fixed
Self-Stabilizing TDMA Algorithms for Dynamic Wireless Ad-hoc Networks
Creators: name: Leone, Pierre
name: Schiller, Elad M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: In dynamic wireless ad-hoc networks (DynWANs), autonomous computing devices set up a network for the communication needs of the moment. These networks require the implementation of a medium access control (MAC) layer. We consider MAC protocols for DynWANs that need to be autonomous and robust as well as have high bandwidth utilization, high predictability degree of bandwidth allocation, and low communication delay in the presence of frequent topological changes to the communication network. Recent studies have shown that existing implementations cannot guarantee the necessary satisfaction of these timing requirements. We propose a self-stabilizing MAC algorithm for DynWANs that guarantees a short convergence period, and by that, it can facilitate the satisfaction of severe timing requirements, such as the above. Besides the contribution in the algorithmic front of research, we expect that our proposal can enable quicker adoption by practitioners and faster deployment of DynWANs that are subject changes in the network topology.
Zero sets of eigenspinors for generic metrics
Creators: name: Hermann, Andreas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C27 (Primary) 58J05, 35J08 (Secondary)

description: Let $M$ be a closed connected spin manifold of dimension $2$ or $3$ with a fixed orientation and a fixed spin structure. We prove that for a generic Riemannian metric on $M$ the non-harmonic eigenspinors of the Dirac operator are nowhere zero. The proof is based on a transversality theorem and the unique continuation property of the Dirac operator.
description: 37 pages
The Relationship of Neighborhood Disadvantage, Biological Aging, and Psychosocial Risk and Resilience Factors in Heart Failure Incidence Among Black Persons: A Moderated Mediation Analysis
Creators: name: Palta, Priya
name: Xiao, Qian
name: Zannas, Anthony S
name: Pike, James R
name: Bey, Ganga S
name: Shah, Amil M
name: Yu, Bing
Publisher: name: Oxford University Press (OUP)
Year: 2023

description:
OBJECTIVES: Deprived living environments contribute to greater heart failure (HF) risk among non-Hispanic Black persons, who disproportionately occupy disadvantaged neighborhoods. The mechanisms for these effects are not fully explicated, partially attributable to an insufficient understanding of the individual factors that contribute additional risk or resilience to the impact of neighborhood disadvantage on health. The objective of this study was, therefore, to clarify the complex pathways over which such exposures act to facilitate more targeted, effective interventions. Given the evidence for a mediating role of biological age and a moderating role of individual psychosocial characteristics in the neighborhood disadvantage-HF link, we tested a moderated mediation mechanism. METHODS: Using multilevel causal moderated mediation models, we prospectively examined whether the association of neighborhood disadvantage with incident HF mediated through accelerated biological aging, captured by the GrimAge epigenetic clock, is moderated by hypothesized psychosocial risk (negative affect) and resilience (optimism) factors. RESULTS: Among a sample of 1,448 Black participants in the shared Jackson Heart Study-Atherosclerosis Risk in Communities cohort (mean age 64.3 years), 334 adjudicated incident hospitalized HF events occurred over a median follow-up of 18 years. In models adjusted for age and sex, the indirect (GrimAge-mediated) effect of neighborhood disadvantage was moderated by psychosocial risk such that for every standard deviation increase in negative affect the hazards of HF was 1.18 (95% confidence interval = 1.05, 1.36). No moderated mediation effect was detected for optimism. DISCUSSION: Findings support the necessity for multilevel interventions simultaneously addressing neighborhood and individual psychosocial risk in the reduction of HF among Black persons.
Testing for dynamical dark energy models with redshift-space distortions
Creators: name: Tsujikawa, Shinji
name: De Felice, Antonio
name: Alcaniz, Jailson
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The red-shift space distortions in the galaxy power spectrum can be used to measure the growth rate of matter density perturbations delta_m. For dynamical dark energy models in General Relativity we provide a convenient analytic formula of f(z) sigma_8(z) written as a function of the redshift z, where f=d ln delta_m/d ln a (a is the cosmological scale factor) and sigma_8 is the rms amplitude of over-density at the scale 8 h^{-1} Mpc. Our formula can be applied to the models of imperfect fluids, quintessence, and k-essence, provided that the dark energy equation of state w does not vary significantly and that the sound speed is not much smaller than 1. We also place observational constraints on dark energy models of constant w and tracking quintessence from the recent data of red-shift space distortions.
description: 15 pages, 5 figures
Accessory parameters for Liouville theory on the torus
Creators: name: Menotti, Pietro
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We give an implicit equation for the accessory parameter on the torus which is the necessary and sufficient condition to obtain the monodromy of the conformal factor. It is shown that the perturbative series for the accessory parameter in the coupling constant converges in a finite disk and give a rigorous lower bound for the radius of convergence. We work out explicitly the perturbative result to second order in the coupling for the accessory parameter and to third order for the one-point function. Modular invariance is discussed and exploited. At the non perturbative level it is shown that the accessory parameter is a continuous function of the coupling in the whole physical region and that it is analytic except at most a finite number of points. We also prove that the accessory parameter as a function of the modulus of the torus is continuous and real-analytic except at most for a zero measure set. Three soluble cases in which the solution can be expressed in terms of hypergeometric functions are explicitly treated.
description: 30 pages, LaTex; typos corrected, discussion of eq.(74) improved
Archives nationales, Journaux et gazettes français et étrangers de la Révolution à la Commune conservés aux Archives nationales. AD XX A et AD XX B, Catalogue par D. Habib sous la direction d'O. Krakovitch, 1998; Archives nationales, Energie et subsistances. Enquêtes sur les moulins à blé an II-1809. Inventaire des articles F20 290 à 296, F 10 226 et 310 par M. Illaire, 1998
Creators: name: Stein, W. H.
Publisher: name: Francia
Year: 2019

description: -
description: Francia, Bd. 26 Nr. 2 (1999)
ELEKTROTEXNIKA FANLARINI O'QITISHDA MOBIL ILOVALARDAN  SAMARALI FOYDALANISH USLUBIYATI
Creators: name: Dilshod Xushvaktovich Xalmanov, Islom Karimov nomidagi Toshkent davlat texnika universiteti dotsenti
name: Dusmuxamedova Saidaxon Alisherovna, Islom Karimov nomidagi Toshkent davlat texnika universiteti assistenti
Publisher: name: Zenodo
Year: 2024

description: Maqolada  texnika  oliy  ta’lim  muassasalarida  talabalarga  elktrotexnika fanlarini o‘qitishda mobil ilovalardan, jumladan elektrotexnika va elektronika fani mustaqil  o‘rganish  uchun  mo‘ljallangan  mobil  ilovaning  imkoniyatlari,  hamda ilovadan  samarali  foydalanish  tartibi  yoritilgan.  Shuningdek,  “Oliy  o‘quv yurtlarida  elektrotexnika  fanlarini  kompetentli  yondashuv  asosida  o‘qitishni takomillashtirish”  mavzusidagi  tadqiqot  ishining  pedagogik  tajriba-sinov  ishlari natijasi bayon qilingan.
Some remarks on the dyadic Rademacher maximal function
Creators: name: Kemppainen, Mikko
Publisher: name: arXiv
Year: 2012
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 42B25 (Primary) 46E40 (Secondary)

description: Properties of a maximal function for vector-valued martingales were studied by the author in an earlier paper. Restricting here to the dyadic setting, we prove the equivalence between (weighted) L^p inequalities and weak type estimates, and discuss an extension to the case of locally finite Borel measures on R^n. In addition, to compensate for the lack of an L^\infty inequality, we derive a suitable BMO estimate. Different dyadic systems in different dimensions are also considered.
description: 11 pages, revised version, appeared in Colloquium Mathematicum
Kernel-based semiparametric multinomial logit modelling of political party affiliation
Creators: name: Langrock, Roland
name: Heidenreich, Nils-Bastian
name: Sperlich, Stefan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Applications (stat.AP)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Conventional, parametric multinomial logit models are in general not sufficient for detecting the complex patterns voter profiles nowadays typically exhibit. In this manuscript, we use a semiparametric multinomial logit model to give a detailed analysis of the composition of a subsample of the German electorate in 2006. Germany is a particularly strong case for more flexible nonparametric approaches in this context, since due to the reunification and the preceding different political histories the composition of the electorate is very complex and nuanced. Our analysis reveals strong interactions of the covariates age and income, and highly nonlinear shapes of the factor impacts for each party's likelihood to be voted. Notably, we develop and provide a smoothed likelihood estimator for semiparametric multinomial logit models, which can be applied also in other application fields, such as, e.g., marketing.
On the spectrum of a class of quantum models
Creators: name: Moroz, Alexander
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The spectrum of any quantum model which eigenvalue equation reduces to a three-term recurrence, such as a displaced harmonic oscillator, the Jaynes-Cummings (JC) model, the Rabi model, and a generalized Rabi model, can be determined as zeros of a corresponding transcendental function F(x). The latter can be analytically determined as an infinite series defined solely in terms of the recurrence coefficients. The ease in obtaining the spectrum is of importance regarding recent experimental advances in preparing ultrastrongly interacting quantum systems, which can no longer be reliably described by the exactly solvable JC model. The relevant computer code has been made freely available online.
description: Kreuser's generalization of Perron's theorem enabled (i) to straightforwardly broaden the definition of the class of quantum models and (ii) to provide a general proof that $\phi_m(z)\in {\cal B}$ (6 pages comprising 3 figures; to appear in Europhys. Lett.)
Limit distributions of random matrices
Creators: name: Lenczewski, Romuald
Publisher: name: arXiv
Year: 2012
Subjects: subject: Operator Algebras (math.OA)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 46L54, 15B52

description: We study limit distributions of independent random matrices as well as limit joint distributions of their blocks under normalized partial traces composed with classical expectation. In particular, we are concerned with the ensemble of symmetric blocks of independent Hermitian random matrices which are asymptotically free, asymptotically free from diagonal deterministic matrices, and whose norms are uniformly bounded. This class contains symmetric blocks of unitarily invariant Hermitian random matrices whose asymptotic distributions are compactly supported probability measures on the real line. Our approach is based on the concept of matricial freeness which is a generalization of freeness in free probability. We show that the associated matricially free Gaussian operators provide a unified framework for studying the limit distributions of sums and products of independent rectangular random matrices, including non-Hermitian Gaussian matrices and matrices of Wishart type. This framework also leads to random matrix models for boolean, monotone and s-free independences.
description: 54 pages, the main change is that we describe the asymptotic joint distributions of symmetric blocks of a larger class of Hermitian random matrices (the former version covered only Gaussian random matrices)
Strong thermomechanical squeezing via weak measurement
Creators: name: Szorkovszky, Alex
name: Brawley, George A.
name: Doherty, Andrew C.
name: Bowen, Warwick P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We experimentally surpass the 3dB limit to steady state parametric squeezing of a mechanical oscillator. The localization of a AFM cantilever, achieved by optimal estimation, is enhanced by up to 6.2 dB in one position quadrature when a detuned parametric drive is used. This squeezing is, in principle, limited only by the oscillator Q-factor. Used on low temperature, high frequency oscillators, this technique provides a pathway to achieve robust quantum squeezing below the zero-point motion. Broadly, our results demonstrate that control systems engineering can overcome well established limits in applications of nonlinear processes. Conversely, by localizing the mechanical position to better than the measurement precision of our apparatus, they demonstrate the usefulness of nonlinearities in control applications.
description: 6 pages, 5 figures including supplementary info
Phase transitions for a collective coordinate coupled to Luttinger liquids
Creators: name: Horovitz, B.
name: Giamarchi, T.
name: Doussal, P. Le
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study various realizations of collective coordinates, e.g. the position of a particle, the charge of a Coulomb box or the phase of a Bose or a superconducting condensate, coupled to Luttinger liquids (LL) with N flavors. We find that for Luttinger parameter 1/2
description: 5 pages, 2 figures, 1 table, Phys. Rev. Lett. (in press)