cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantifying the role of antiferromagnetic fluctuations in the superconductivity of the doped Hubbard model
Creators: name: Dong, Xinyang
name: Gull, Emanuel
name: Millis, Andrew. J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We study the contribution of the electron-spin fluctuation coupling to the superconducting state of the two dimensional Hubbard model within dynamical cluster approximation (DCA) using a numerical exact continuous time Monte Carlo solver. By analyzing the frequency dependence of the self energy, we show that only about half of the superconductivity can be attributed to a "pairing glue" arising from treating spin fluctuations as a pairing boson in the standard one-loop theory.
The classification of preordered spaces in terms of monotones: complexity and optimization
Creators: name: Hack, Pedro
name: Braun, Daniel A.
name: Gottwald, Sebastian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: Information Theory (cs.IT)
subject: Theoretical Economics (econ.TH)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Economics and business

description: The study of complexity and optimization in decision theory involves both partial and complete characterizations of preferences over decision spaces in terms of real-valued monotones. With this motivation, and following the recent introduction of new classes of monotones, like injective monotones or strict monotone multi-utilities, we present the classification of preordered spaces in terms of both the existence and cardinality of real-valued monotones and the cardinality of the quotient space. In particular, we take advantage of a characterization of real-valued monotones in terms of separating families of increasing sets in order to obtain a more complete classification consisting of classes that are strictly different from each other. As a result, we gain new insight into both complexity and optimization, and clarify their interplay in preordered spaces.
Chemoton 2.0: Autonomous Exploration of Chemical Reaction Networks
Creators: name: Unsleber, Jan P.
name: Grimmel, Stephanie A.
name: Reiher, Markus
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Fueled by advances in hardware and algorithm design, large-scale automated explorations of chemical reaction space have become possible. Here, we present our approach to an open-source, extensible framework for explorations of chemical reaction mechanisms based on the first principles of quantum mechanics. It is intended to facilitate reaction network explorations for diverse chemical problems with a wide range of goals such as mechanism elucidation, reaction path optimization, retrosynthetic path validation, reagent design, and microkinetic modeling. The stringent first-principles basis of all algorithms in our framework is key for the general applicability that avoids any restrictions to specific chemical systems. Such an agile framework requires multiple specialized software components of which we present three modules in this work. The key module, Chemoton,drives the exploration of reaction networks. For the exploration itself, we introduce two new algorithms for elementary-step searches that are based on Newton trajectories. The performance of these algorithms is assessed for a variety of reactions characterized by a broad chemical diversity in terms of bonding patterns and chemical elements. We reproduce and significantly extend what is known about these reactions and provide the resulting data to be used as a starting point for further explorations and for future reference.
description: 44 pages, 14 figures, 3 tables
On the behaviour of streams in angle and frequency spaces in different potentials
Creators: name: Buist, Hans J. T.
name: Helmi, Amina
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have studied the behaviour of stellar streams in the Aquarius fully cosmological N-body simulations of the formation of Milky Way halos. In particular, we have characterised the streams in angle/frequency spaces derived using an approximate but generally well-fitting spherical potential. We have also run several test-particle simulations to understand and guide our interpretation of the different features we see in the Aquarius streams. Our goal is both to establish which deviations of the expected action-angle behaviour of streams exist because of the approximations made on the potential, but also to derive to what degree we can use these coordinates to model streams reliably. We have found that many of the Aquarius streams wrap in angle space along relatively straight lines, and also in frequency space. On the other hand, from our controlled simulations we have been able to establish that deviations from spherical symmetry, the use of incorrect potentials and the inclusion of self-gravity lead to streams in angle space to still be along relatively straight lines but also to depict wiggly behaviour whose amplitude increases as the approximation to the true potential becomes worse. In frequency space streams typically become thicker and somewhat distorted. Therefore, our analysis explains most of the features seen in the approximate angle and frequency spaces for the Aquarius streams with the exception of their somewhat `noisy' and `patchy' morphologies. These are likely due to the interactions with the large number of dark matter subhalos present in the cosmological simulations. Since the measured angle-frequency misalignments of the Aquarius streams can largely be attributed to using the wrong (spherical) potential, determining the mass growth history of these halos will only be feasible once the true potential has been determined robustly.
description: 21 pages, 18 figures. Accepted for publication in A&A
Trees
Creators: name: Epstein, Henri
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: An algebraic formalism, developped with V. Glaser and R. Stora for the study of the generalized retarded functions of quantum field theory, is used to prove a factorization theorem which provides a complete description of the generalized retarded functions associated with any tree graph. Integrating over the variables associated to internal vertices to obtain the perturbative generalized retarded functions for interacting fields arising from such graphs is shown to be possible for a large category of space-times.
description: minor corrections, references added, no change in results
Relevant deformations and c-extremization
Creators: name: Melnikov, Ilarion V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider RG flows obtained by a relevant deformation from unitary and compact two-dimensional (0,2) SCFTs. We point out that an N=2 super-Kac-Moody algebra present in the UV is preserved by the flow and does not mix with the R-current. On the other hand, a direct sum of N=2 algebras in the UV theory leads to a few complications in determining the IR R-symmetry; nevertheless, in flows without accidental IR symmetries, we determine the IR R-symmetry and show that it maximizes the IR central charge.
description: 10 pages; v2 minor revision
Mott correlations in ABC graphene trilayer aligned with hBN
Creators: name: Calderón, M. J.
name: Camjayi, A.
name: Bascones, E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The nature of the correlated phases found in some graphene heterostructures is under debate. We use dynamical mean-field theory (DMFT) to analyze the effect of local correlations close to half-filling on one of such systems, the ABC trilayer graphene aligned with hexagonal boron nitride (ABC/hBN), which presents a moiré superlattice. This system has shown insulating phases at integer fillings of the moiré lattice, precisely the fillings at which a sufficiently strong Coulomb interaction (U$_{\rm Mott}$) may produce a metal-insulator Mott transition. Our calculations show that the electronic states are strongly affected by a significant spectral weight transfer at interactions with magnitudes expected to be relevant in experiments. This effect, which emerges at interactions considerably smaller than U$_{\rm Mott}$ and does not require symmetry breaking, impacts the electronic properties at temperatures above the magnetic transitions producing anomalous temperature and doping dependences not present without alignment to hBN. Close to the Mott transition we find that onsite interactions promote an antiferromagnetic (AF) state, probably breaking the C$_3$ symmetry, that will compete with the ferromagnetism arising from intersite exchange interactions to determine the ground state.
description: 9 pages, 4 figures (including the supplemental material)
Bistability, Bifurcations and Chaos in the Mackey-Glass Equation
Creators: name: Duruisseaux, Valentin
name: Humphries, Antony R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: Primary: 34K18, 34K60. Secondary: 34K13, 34K23, 37G15, 37L30, 37N25

description: Numerical bifurcation analysis, and in particular two-parameter continuation, is used in consort with numerical simulation to reveal complicated dynamics in the Mackey-Glass equation for moderate values of the delay close to the onset of chaos. In particular a cusp bifurcation of periodic orbits and resulting branches of folds of periodic orbits effectively partition the parameter space into regions where different behaviours are seen. The cusp bifurcation leads directly to bistability between periodic orbits, and subsequently to bistability between a periodic orbit and a chaotic attractor. This leads to two different mechanisms by which the chaotic attractor is destroyed in a global bifurcation with a periodic orbit in either an interior crisis or a boundary crisis. In another part of parameter space a sequence of subcritical period-doublings is found to give rise to bistability between a periodic orbit and a chaotic attractor. Torus bifurcations, and a codimension-two fold-flip bifurcation are also identified, and Lyapunov exponent computations are used to determine chaotic regions and attractor dimension.
Solutions to the Painlevé V equation through supersymmetric quantum mechanics
Creators: name: Bermudez, David
name: C., David J. Fernández
name: Negro, Javier
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: Quantum Algebra (math.QA)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In this paper we shall use the algebraic method known as supersymmetric quantum mechanics (SUSY QM) to obtain solutions to the Painlevé V (PV) equation, a second-order non-linear ordinary differential equation. For this purpose, we will apply first the SUSY QM treatment to the radial oscillator. In addition, we will revisit the polynomial Heisenberg algebras (PHAs) and we will study the general systems ruled by them: for first-order PHAs we obtain the radial oscillator, while for third-order PHAs the potential will be determined by solutions to the PV equation. This connection allows us to introduce a simple technique for generating solutions of the PV equation expressed in terms of confluent hypergeometric functions. Finally, we will classify them into several solution hierarchies.
description: 39 pages, 18 figures, 4 tables, 70 references
Flat FLRW Universe in logarithmic symmetric teleparallel gravity with observational constraints
Creators: name: Koussour, M.
name: Shekh, S. H.
name: Hanin, A.
name: Sakhi, Z.
name: Bhoyer, S. R.
name: Bennai, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper, we investigate the homogeneous and isotropic flat FLRW Universe in the logarithmic form of $f\left( Q\right) $ gravity, where $% Q $ is the non-metricity scalar, specifically, $f\left( Q\right) =α+β\log \left( Q\right) $, where $α$ and $β$ are free model parameters. In this study, we consider a parametrization of the Hubble parameter as $H\left( z\right) =η\left[ (z+1)^{-γ}+1\right] $, where $γ$ and $η$ are model/free parameters which are constrained by an $R^{2}$-test from 57 points of the Hubble datasets in the redshift range $0.07
description: CQG accepted version
Boundaries and automorphisms of hierarchically hyperbolic spaces
Creators: name: Durham, Matthew G.
name: Hagen, Mark F.
name: Sisto, Alessandro
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geometric Topology (math.GT)
subject: Group Theory (math.GR)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: Hierarchically hyperbolic spaces provide a common framework for studying mapping class groups of finite type surfaces, Teichmüller space, right-angled Artin groups, and many other cubical groups. Given such a space $\mathcal X$, we build a bordificationcompatible with the hierarchically hyperbolic structure. If $\mathcal X$ is proper, we get a compactification of $\mathcal X$; we also prove that our construction generalizes the Gromov boundary of a hyperbolic space. In our first main set of applications, we introduce a notion of geometrical finiteness for hierarchically hyperbolic subgroups of hierarchically hyperbolic groups in terms of boundary embeddings. As primary examples of geometrical finiteness, we prove that the natural inclusions of finitely generated Veech groups and the Leininger-Reid combination subgroups extend to continuous embeddings of their Gromov boundaries into the boundary of the mapping class group, both of which fail to happen with the Thurston compactification of Teichmüller space. Our second main set of applications are dynamical and structural, built upon our classification of automorphisms of hierarchically hyperbolic spaces and analysis of how the various types of automorphisms act on the boundary. We prove a generalization of the Handel-Mosher "omnibus subgroup theorem" for mapping class groups to all hierarchically hyperbolic groups, obtain a new proof of the Caprace-Sageev rank-rigidity theorem for many CAT(0) cube complexes, and identify the boundary of a hierarchically hyperbolic group as its Poisson boundary; these results rely on a theorem detecting \emph{irreducible axial} elements of a group acting on a hierarchically hyperbolic space (which generalize pseudo-Anosov elements of the mapping class group and rank-one isometries of a cube complex not virtually stabilizing a hyperplane).
description: 67 pages. Various corrections in light of referee's comments
Diverse anisotropy of phonon transport in two-dimensional IV-VI compounds: A comparative study
Creators: name: Qin, Guangzhao
name: Qin, Zhenzhen
name: Fang, Wu-Zhang
name: Zhang, Li-Chuan
name: Yue, Sheng-Ying
name: Yan, Qing-Bo
name: Hu, Ming
name: Su, Gang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: New classes two-dimensional (2D) materials beyond graphene, including layered and non-layered, and their heterostructures, are currently attracting increasing interest due to their promising applications in nanoelectronics, optoelectronics and clean energy, where thermal transport property is one of the fundamental physical parameters. In this paper, we systematically investigated the phonon transport properties of 2D orthorhombic group IV-VI compounds of $GeS$, $GeSe$, $SnS$ and $SnSe$ by solving the Boltzmann transport equation (BTE) based on first-principles calculations. Despite the similar puckered (hinge-like) structure along the armchair direction as phosphorene, the four monolayer compounds possess diverse anisotropic properties in many aspects, such as phonon group velocity, Young's modulus and lattice thermal conductivity ($κ$), etc. Especially, the $κ$ along the zigzag and armchair directions of monolayer $GeS$ shows the strongest anisotropy while monolayer $SnS$ and $SnSe$ shows an almost isotropy in phonon transport. The origin of the diverse anisotropy is fully studied and the underlying mechanism is discussed in detail. With limited size, the $κ$ could be effectively lowered, and the anisotropy could be effectively modulated by nanostructuring, which would extend the applications in nanoscale thermoelectrics and thermal management. Our study offers fundamental understanding of the anisotropic phonon transport properties of 2D materials, and would be of significance for further study, modulation and aplications in emerging technologies.
description: 14 pages, 8 figures, 2 tables
Weremchuck, Max S.: John Nelson Darby und die Anfänge einer Bewegung
Creators: name: Bister, Ulrich
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 182130232X
description: Jahrbuch für evangelikale Theologie, V. 3 (1989): Jahrbuch für evangelikale Theologie, Band 3
Sampling measures, Muckenhoupt Hamiltonians, and triangular factorization
Creators: name: Bessonov, R. V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 34L05, Secondary 47B35

description: Let $μ$ be an even measure on the real line $\mathbb{R}$ such that $$c_1 \int_{\mathbb{R}}|f|^2\,dx \le \int_{\mathbb{R}}|f|^2\,dμ\le c_2\int_{\mathbb{R}}|f|^2\,dx$$ for all functions $f$ in the Paley-Wiener space $\mathrm{PW}_{a}$. We prove that $μ$ is the spectral measure for the unique Hamiltonian $\mathcal{H}=\left(w&00&\frac{1}{w}\right)$ on $[0,a]$ generated by a weight $w$ from the Muckenhoupt class $A_2[0,a]$. As a consequence of this result, we construct Krein's orthogonal entire functions with respect to $μ$ and prove that every positive, bounded, invertible Wiener-Hopf operator on $[0,a]$ with real symbol admits triangular factorization.
description: 19 pages
Polaronic Conductivity in Cr$_2$Ge$_2$Te$_6$ Single Crystals
Creators: name: Liu, Yu
name: Han, Myung-Geun
name: Lee, Yongbin
name: Ogunbunmi, Michael O.
name: Du, Qianheng
name: Nelson, Christie
name: Hu, Zhixiang
name: Stavitski, Eli
name: Graf, David
name: Attenkofer, Klaus
name: Bobev, Svilen
name: Ke, Liqin
name: Zhu, Yimei
name: Petrovic, C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Intrinsic, two-dimensional (2D) ferromagnetic semiconductors are an important class of materials for spin-charge conversion applications. Cr$_2$Ge$_2$Te$_6$ retains long-range magnetic order in bilayer at cryogenic temperatures and shows complex magnetic interactions with considerable magnetic anisotropy. Here, we performed a series of structural, magnetic, X-ray scattering, electronic, thermal transport and first-principles calculation studies which reveal that localized electronic charge carriers in Cr$_2$Ge$_2$Te$_6$ are dressed by surrounding lattice and are involved in polaronic transport via hopping that is sensitive on details of magnetocrystalline anisotropy. This opens possibility for manipulation of charge transport in Cr$_2$Ge$_2$Te$_6$ - based devices by electron-phonon- and spin-orbit coupling-based tailoring of polaron properties.
السجع في سورة الرحمن: دراسة تحليلية بلاغية The Rhyme Prose in the verse of “Rahman: Rhetorical analytical study
Creators: name: Mohd Nawi, Muhammad Zulazizi
Publisher: name: figshare
Year: 2023
Subjects: Middle Eastern languages

description: This research is discussing “As-Saja’” (Rhymed Prose) in the verse of “Rahman”. “As-Saja’” is one of the various forms of “Muhasanat Lafziah” (Beautiful of Verbal) discussion in the vicinity of “Balaghah” (Rhetoric). This research gives an understanding and explanation for those who didn’t understand “As-Saja’”. And this research focuses on analysis research based on a qualitative method which means the researcher refers to sources from books “Balaghah” that relate to “As-Saja’”. This research studies “As-Saja’” and its specialty in “Ilmu Balaghah” (Rhetorical Knowledge). The researcher will start this research with the elaborate meaning of “As-Saja’” and gives examples until understands it. Then, the researcher will search ‘Uslub As-Saja’” (Rhymed Prose Style) in the verse of “Rahman” to identify the number and position of “Uslub As-Saja’” in this verse. The resulting research shows that the verse of “Rahman” contains with ‘Uslub Balaghah’ (Rhetorical Style) includes the “As-Saja’”. ( اعتمد هذا البحث على السجع في سورة الرحمن. والسجع هو أحد فروع من المحسنات اللفظية حول محور مناقشة علم البلاغة في علم البديع. هذا البحث يقدم الفهم والتبيان إلى من لم يفهموا عن السجع بشكل موضوعي. أنّ هذا البحث يقدم المنهج المكتبي والتحليلي، يعني الباحث يحتاج الرجوع إلى المصادر من الكتب البلاغة الذين يتعلق بالسجع. ويدرس هذا البحث عن السجع وجماله في علم البلاغة. سيقوم الباحث بالتعرف معنى السجع والإستفادة من الأمثلة عنه حتى توضيح صورة السجع ومفهومه. ثم، تحليل الباحث عن السجع في سورة الرحمن لتبحث عن عدد السجع في سورة الرحمن والتعرف موقعة أساليب السجع في سورة الرحمن. ونتيجة من هذا البحث، أورد الباحث أنّ سورة الرحمن تتضمن فيها أساليب بلاغية لا سيما بما تتعلق بالسجع.)
A comparative study of 3D Cumulant and Central Moments lattice Boltzmann schemes with interpolated boundary conditions for the simulation of thermal flows in high Prandtl number regime
Creators: name: Gruszczyński, G.
name: Łaniewski-Wołłk, Ł.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Thermal flows characterized by high Prandtl number are numerically challenging as the transfer of momentum and heat occurs at different time scales. To account for very low thermal conductivity and obey the Courant-Friedrichs-Lewy condition, the numerical diffusion of the scheme has to be reduced. As a consequence, the numerical artefacts are dominated by dispersion errors commonly known as wiggles. In this study, we explore possible remedies in the framework of the lattice Boltzmann method by applying novel collision kernels, lattices with a large number of discrete velocities, namely D3Q27, and second-order boundary conditions. For the first time, the cumulant-based collision operator is utilised to simulate both the hydrodynamic and the thermal field. Alternatively, the advected field is computed using the central moments' collision operator. Different relaxation strategies have been examined to account for additional degrees of freedom introduced by a higher-order lattice. To validate the proposed kernels for a pure advection-diffusion problem, the numerical simulations are compared against an analytical solution of a Gaussian hill. The structure of the numerical dispersion is shown by simulating advection and diffusion of a square indicator function. Finally, a study of steady forced heat convection from a confined cylinder is performed and compared against a FEM solution. Numerical results confirm that the relaxation scheme of the advected field must be adjusted to profit from lattice with a larger number of discrete velocities. In all of the performed benchmarks, the beneficial effect of the two relaxation time approach has been shown to be superior or at least as good as counter-candidating kernels.
Heisenberg-Weyl Observables: Bloch vectors in phase space
Creators: name: Asadian, Ali
name: Erker, Paul
name: Huber, Marcus
name: Klöckl, Claude
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a Hermitian generalization of Pauli matrices to higher dimensions which is based on Heisenberg-Weyl operators. The complete set of Heisenberg-Weyl observables allows us to identify a real-valued Bloch vector for an arbitrary density operator in discrete phase space, with a smooth transition to infinite dimensions. Furthermore, we derive bounds on the sum of expectation values of any set of anti-commuting observables. Such bounds can be used in entanglement detection and we show that Heisenberg-Weyl observables provide a first non-trivial example beyond the dichotomic case.
description: 10 pages, 1 figure. Closed to the published version
Time-assisted energy reconstruction in a highly-granular hadronic calorimeter
Creators: name: Graf, Christian
name: Simon, Frank
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The software compensation algorithms developed for the CALICE Analog Hadron Calorimeter are extended to incorporate time information on the cell level, and the performance is studied in GEANT4 simulations with a detector model of a highly-granular SiPM-on-tile calorimeter. The addition of nanosecond-level time resolution is found to result in significant improvement of the energy resolution by approximately 3% to 4% for local software compensation compared to the software compensation based on local energy density alone, with further improvement possible with better timing resolution. The high correlation of energy density and time variables show that both provide sensitivity to correlated underlying shower features, which limits the potential of timing information when used as a global rather than a local variable.
description: 13 pages, 9 figures, accepted for publication in JINST
The infrared behavior of tame two-field cosmological models
Creators: name: Babalic, Elena Mirela
name: Lazaroiu, Calin Iuliu
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the first order infared behavior of tame hyperbolizable two-field cosmological models, defined as those classical two-field models whose scalar manifold is a connected, oriented and topologically finite hyperbolizable Riemann surface $(Σ,\mathcal{G})$ and whose scalar potential $Φ$ admits a positive and Morse extension to the end compactification of $Σ$. We achieve this by determining the universal forms of the asymptotic gradient flow of the classical effective potential $V$ with respect to the uniformizing metric $G$ near all interior critical points and ends of $Σ$, finding that some of the latter act like fictitious but exotic stationary points of the gradient flow. We also compare these results with numerical studies of cosmological orbits. For critical cusp ends, we find that cosmological curves have transient quasiperiodic behavior but are eventually attracted or repelled by the cusp along principal geodesic orbits determined by the extended effective potential. This behavior is approximated in the infrared by that of gradient flow curves near the cusp.
description: 52 pages, numerous figures; v2:some typos corrected, references added
Nucleon matrix elements from lattice QCD with all-mode-averaging and a domain-decomposed solver: an exploratory study
Creators: name: von Hippel, Georg
name: Rae, Thomas D.
name: Shintani, Eigo
name: Wittig, Hartmut
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We study the performance of all-mode-averaging (AMA) when used in conjunction with a locally deflated SAP-preconditioned solver, determining how to optimize the local block sizes and number of deflation fields in order to minimize the computational cost for a given level of overall statistical accuracy. We find that AMA enables a reduction of the statistical error on nucleon charges by a factor of around two at the same cost when compared to the standard method. As a demonstration, we compute the axial, scalar and tensor charges of the nucleon in $N_f=2$ lattice QCD with non-perturbatively O(a)-improved Wilson quarks, using O(10,000) measurements to pursue the signal out to source-sink separations of $t_s\sim 1.5$ fm. Our results suggest that the axial charge is suffering from a significant amount (5-10%) of excited-state contamination at source-sink separations of up to $t_s\sim 1.2$ fm, whereas the excited-state contamination in the scalar and tensor charges seems to be small.
description: 24 pages, 11 figures (25 pdf files); v3:version to appear in Nucl.Phys.B
Brecht, Martin (Hrsg.): Pietismus und Neuzeit
Creators: name: Padberg, Lutz Von
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1821302079
description: Jahrbuch für evangelikale Theologie, V. 3 (1989): Jahrbuch für evangelikale Theologie, Band 3
Almost Kähler metrics and pp-wave spacetimes
Creators: name: Aazami, Amir Babak
name: Ream, Robert
Publisher: name: arXiv
Year: 2022
Subjects: subject: Differential Geometry (math.DG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We establish a one-to-one correspondence between a class of strictly almost Kähler metrics on the one hand, and Lorentzian pp-wave spacetimes on the other; the latter metrics are well known in general relativity, where they model radiation propagating at the speed of light. Specifically, we construct families of complete almost Kähler metrics by deforming pp-waves via their propagation wave vector. The almost Kähler metrics we obtain exist in all dimensions $2n \geq 4$, and are defined on both $\mathbb{R}^{2n}$ and $\mathbb{S}^1\times\mathbb{S}^1 \times M$, where $M$ is any closed almost Kähler manifold; they are not warped products, they include noncompact examples with constant negative scalar curvature, and all of them have the property that their fundamental 2-forms are also co-closed with respect to the Lorentzian pp-wave metric. Finally, we further deepen this relationship between almost Kähler and Lorentzian geometry by utilizing Penrose's "plane wave limit," by which every spacetime has, locally, a pp-wave metric as a limit: using Penrose's construction, we show that in all dimensions $2n \geq 4$, every Lorentzian metric admits, locally, an almost Kähler metric of this form as a limit.
description: 16 pages; published version, with new Corollary 3 added
Neural Enhancement of Factor Graph-based Symbol Detection
Creators: name: Schmid, Luca
name: Schmalen, Laurent
Publisher: name: arXiv
Year: 2022
Subjects: subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We study the application of the factor graph framework for symbol detection on linear inter-symbol interference channels. Cyclic factor graphs have the potential to yield low-complexity symbol detectors, but are suboptimal if the ubiquitous sum-product algorithm is applied. In this paper, we present and evaluate strategies to improve the performance of cyclic factor graph-based symbol detection algorithms by means of neural enhancement. In particular, we apply neural belief propagation as an effective way to counteract the effect of cycles within the factor graph. We further propose the application and optimization of a linear preprocessor of the channel output. By modifying the observation model, the preprocessing can effectively change the underlying factor graph, thereby significantly improving the detection performance as well as reducing the complexity.
description: Published in: 2022 IEEE 23rd International Workshop on Signal Processing Advances in Wireless Communication (SPAWC)
Universal optical conductivity of a disordered Weyl semimetal
Creators: name: Roy, Bitan
name: Juricic, Vladimir
name: Sarma, Sankar Das
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Topological Weyl semimetals, besides manifesting chiral anomaly, can also accommodate a disorder-driven unconventional quantum phase transition into a metallic phase. A fundamentally and practically important question in this regard concerns an experimentally measurable quantity that can clearly distinguish these two phases. We show that the optical conductivity while serving this purpose can also play the role of a bonafide order parameter across such disorder-driven semimetal-metal quantum phase transition by virtue of displaying distinct scaling behavior in semimetallic and metallic phases, as well as inside the quantum critical fan supporting a non-Fermi liquid. We demonstrate that the correction to dielectric constant and optical conductivity in a dirty Weyl semimetal due to weak disorder is independent of the actual nature of point-like impurity scatterers. Therefore, optical conductivity can be used as an experimentally measurable quantity to study the critical properties and to pin the universality class of the disorder-driven quantum phase transition in Weyl semimetals.
description: 5.5 Pages and 1 Figure (Supplementary: 7.5 Pages and 1 Figure: Published version, new references, added discussion
On the absence of the Boulware-Deser ghost in novel graviton kinetic terms
Creators: name: Li, Wenliang
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Using novel nonlinear kinetic terms for gravitons, a large class of bi-gravity models were constructed, which are potentially free of the Boulware-Deser (BD) ghost. In this work, we derive their Hamiltonians using the ADM formalism, and verify that the BD ghost is eliminated by additional constraints. The general Hamiltonian structure is analogous to that of the other class of bi-gravity models free of the BD ghost.
description: 14 pages, two columns, v2; major modification: constraint structure discussed, references added
Characterization and Lower Bounds for Branching Program Size using Projective Dimension
Creators: name: Dinesh, Krishnamoorthy
name: Koroth, Sajin
name: Sarma, Jayalal
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences
subject: F.1.1; F.1.3

description: We study projective dimension, a graph parameter (denoted by pd$(G)$ for a graph $G$), introduced by (Pudlák, Rödl 1992), who showed that proving lower bounds for pd$(G_f)$ for bipartite graphs $G_f$ associated with a Boolean function $f$ imply size lower bounds for branching programs computing $f$. Despite several attempts (Pudlák, Rödl 1992 ; Babai, Rónyai, Ganapathy 2000), proving super-linear lower bounds for projective dimension of explicit families of graphs has remained elusive. We show that there exist a Boolean function $f$ (on $n$ bits) for which the gap between the projective dimension and size of the optimal branching program computing $f$ (denoted by bpsize$(f)$), is $2^{Ω(n)}$. Motivated by the argument in (Pudlák, Rödl 1992), we define two variants of projective dimension - projective dimension with intersection dimension 1 (denoted by upd$(G)$) and bitwise decomposable projective dimension (denoted by bitpdim$(G)$). As our main result, we show that there is an explicit family of graphs on $N = 2^n$ vertices such that the projective dimension is $O(\sqrt{n})$, the projective dimension with intersection dimension $1$ is $Ω(n)$ and the bitwise decomposable projective dimension is $Ω(\frac{n^{1.5}}{\log n})$. We also show that there exist a Boolean function $f$ (on $n$ bits) for which the gap between upd$(G_f)$ and bpsize$(f)$ is $2^{Ω(n)}$. In contrast, we also show that the bitwise decomposable projective dimension characterizes size of the branching program up to a polynomial factor. That is, there exists a constant $c>0$ and for any function $f$, $\textrm{bitpdim}(G_f)/6 \le \textrm{bpsize}(f) \le (\textrm{bitpdim}(G_f))^c$. We also study two other variants of projective dimension and show that they are exactly equal to well-studied graph parameters - bipartite clique cover number and bipartite partition number respectively.
description: 24 pages, 3 figures
Puzzle maker in SmB6: accompany-type valence fluctuation state
Creators: name: Sun, Liling
name: Wu, Qi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In recent years, the study on the Kondo insulator SmB6, a strongly correlated electron material with decades-long puzzles, has become one of the most attractive topics again because the discovery of the coexistence of its unusual metallic surface state with an insulating bulk. Many efforts have been made in understanding the corresponding physics behind in SmB6, but some puzzles on it, being hotly debated and argued, has not been solved. In this article, based on the latest progress in our high pressure studies and the accumulating results reported by other groups on SmB6, we propose a notion named as accompany-type valence fluctuation state, which possibly coexists with the Kondo ground state of SmB6. The purpose of this article is to search a common starting point from which most of the accumulated low-temperature phenomena observed by different experimental investigations on SmB6 could be understood in a unified way. Although this notion is only our personal understanding from a phenomenological point of view and may be immature, anyway, we expect that this notion could attract rigorous theoretical interpretations and further experimental investigations, or stimulate better thinking on the physics in SmB6.
description: 15 pages, 3 figures and 1 table
Testing of RESCUE MIMS on-board robotic platforms and drones
Creators: name: Guerri, Marco
name: Areoluci, Francesco
name: Karma, Sofia
name: Merlini, Marco
name: Müller, Nikolas
Publisher: name: Zenodo
Year: 2022
Subjects: MIMS
Robots
Search and rescue
robotic platform
drones
Obstacle detection system

description: The Task 5.4 called “Testing of RESCUE MIMS on-board robotic platforms and drones” is an activity lead between Month 10 and Month 30 in the Project Search & Rescue.
 The main scope of T5.4 is to test the robotic platform provided by DFKI with its sensors (Cameras and LIDAR), the Obstacle Detection System (ODS) provided by THALIT and the field chemical tool (RESCUE MIMS) provided by the NTUA together with the drone provided by UHasselt.
 In order to share all the possible interface from Telecom, Power, Physical and Logical point of view a dedicated Interface Control Document has been developed in order to align all partners on the mutual interfaces.
 Within the Task 5.4 some specific tests are foreseen, for example the ODS algorithm will be tested with some images provided by the end users, the robot will be tested with a dedicated test and the RESCUE-MIMS will be tested in lab-scale experiments
 The related deliverables foreseen in the Task 5.4 are two: the D5.4 “Testing of RESCUE MIMS on-board robotic platforms and drones” (this document) where the topic is introduced as per status of the project and the D5.8 “Testing of RESCUE MIMS on-board robotic platforms and drones, V2” that is the revision 02 of the D5.4 with the possibility to finalize all paragraphs not ready at the moment of the D5.4 release.
 The main objectives and outcomes of the D5.8 “Testing of RESCUE MIMS on-board robotic platforms and drones, V2” are the description of the platform robot with its sensors (Cameras and LIDAR), the Obstacle Detection System (ODS), the field chemical tool (RESCUE MIMS) and the drone; in particular it is described the integration and the interfaces between all these components following the activities of Task 5.4. Moreover, it is introduced the testing procedures of the whole technological platform and at the end the test reports.
 The milestone submission of D5.8 is at the end of Month 30, moreover the Use Case where all the components will be tested together is the number 4, named “Forest fire expanded and threat to industrial zone (Corinthia, Greece)” that is foreseen in November 2022.
Optimal embeddings by unbiased shifts of Brownian motion
Creators: name: Morters, Peter
name: Redl, Istvan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J65

description: An unbiased shift of the two-sided Brownian motion $(B_t \colon t\in{\mathbb R})$ is a random time $T$ such that $(B_{T+t} \colon t\in{\mathbb R})$ is still a two-sided Brownian motion. Given a pair $μ, ν$ of orthogonal probability measures, an unbiased shift $T$ solves the embedding problem, if $B_0\simμ$ implies $B_{T}\simν$. A solution to this problem was given by Last et al. (2014), based on earlier work of Bertoin and Le Jan (1992), and Holroyd and Liggett (2001). In this note we show that this solution minimises ${\mathbb E} ψ(T)$ over all nonnegative unbiased solutions $T$, simultaneously for all nonnegative, concave functions $ψ$. Our proof is based on a discrete concavity inequality that may be of independent interest.
description: 10 pages
Perturbativity, vacuum stability and inflation in the light of 750 GeV diphoton excess
Creators: name: Dhuria, Mansi
name: Goswami, Gaurav
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The recent observation of the 750 GeV diphoton excess at 13 TeV LHC has motivated many scenarios of physics beyond the Standard Model. In this work, we begin by showing that many models which explain the observed excess tend to get strongly coupled well below the Planck scale. We then study a simple scenario involving colored vector-like fermions with exotic charges, which is expected to stay weakly coupled till the Planck scale. We find the conditions under which this happens, derive the Renormalization Group equations for such models and solve them to show that perturbativity till Planck scale can be maintained for a very reasonable choice of parameters. Finally, we discuss issues related to vacuum stability and the possibility of inflation in the scenarios we study.
description: 16 pages, 6 figures. Journal version (to appear in Phy. Rev. D)
Conformal embeddings of affine vertex algebras in minimal $W$-algebras I: structural results
Creators: name: Adamovic, Drazen
name: Kac, Victor G.
name: Frajria, Pierluigi Moseneder
name: Papi, Paolo
name: Perse, Ozren
Publisher: name: arXiv
Year: 2016
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We find all values of $k\in \mathbb C$, for which the embedding of the maximal affine vertex algebra in a simple minimal W-algebra $W_k(\mathfrak g,θ)$ is conformal, where $\mathfrak g$ is a basic simple Lie superalgebra and $-θ$ its minimal root. In particular, it turns out that if $W_k(\mathfrak g,θ)$ does not collapse to its affine part, then the possible values of these $k$ are either $-\frac{2}{3} h^\vee$ or $-\frac{h^\vee-1}{2}$, where $h^\vee$ is the dual Coxeter number of $\mathfrak g$ for the normalization $(θ,θ)=2$. As an application of our results, we present a realization of simple affine vertex algebra $V_{-\tfrac{n+1}{2} } (sl(n+1))$ inside of the tensor product of the vertex algebra $W_{\tfrac{n-1}{2}} (sl(2| n), θ)$ (also called the Bershadsky-Knizhnik algebra) with a lattice vertex algebra.
description: Latex File, 30 pages, minor corrections
Temporal Network Epistemology: on Reaching Consensus in Real World Setting
Creators: name: Michalski, Radosław
name: Serwata, Damian
name: Nurek, Mateusz
name: Szymanski, Boleslaw K.
name: Kazienko, Przemysław
name: Jia, Tao
Publisher: name: arXiv
Year: 2022
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: This work develops the concept of temporal network epistemology model enabling the simulation of the learning process in dynamic networks. The results of the research, conducted on the temporal social network generated using the CogSNet model and on the static topologies as a reference, indicate a significant influence of the network temporal dynamics on the outcome and flow of the learning process. It has been shown that not only the dynamics of reaching consensus is different compared to baseline models but also that previously unobserved phenomena appear, such as uninformed agents or different consensus states for disconnected components. It has been also observed that sometimes only the change of the network structure can contribute to reaching consensus. The introduced approach and the experimental results can be used to better understand the way how human communities collectively solve both complex problems at the scientific level and to inquire into the correctness of less complex but common and equally important beliefs' spreading across entire societies.
Asymmetric Nuclear Matter and Neutron Star Properties in Relativistic ab initio Theory in the Full Dirac Space
Creators: name: Wang, Sibo
name: Tong, Hui
name: Zhao, Qiang
name: Wang, Chencan
name: Ring, Peter
name: Meng, Jie
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The long-standing controversy about the isospin dependence of the effective Dirac mass in ab initio calculations of asymmetric nuclear matter is clarified by solving the relativistic Brueckner-Hartree-Fock equations in the full Dirac space. The symmetry energy and its slope parameter at the saturation density are $E_{\text{sym}}(ρ_0)=33.1$ MeV and $L=65.2$ MeV, in agreement with empirical and experimental values. Further applications predict the neutron star radius $R_{1.4M_\odot}\approx 12$ km and the maximum mass of a neutron star $M_{\text{max}}\leq 2.4M_\odot$.
description: 6 pages, 3 figures
Spectral form factor in a minimal bosonic model of many-body quantum chaos
Creators: name: Roy, Dibyendu
name: Mishra, Divij
name: Prosen, Tomaž
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study spectral form factor in periodically-kicked bosonic chains. We consider a family of models where a Hamiltonian with the terms diagonal in the Fock space basis, including random chemical potentials and pair-wise interactions, is kicked periodically by another Hamiltonian with nearest-neighbor hopping and pairing terms. We show that for intermediate-range interactions, random phase approximation can be used to rewrite the spectral form factor in terms of a bi-stochastic many-body process generated by an effective bosonic Hamiltonian. In the particle-number conserving case, i.e., when pairing terms are absent, the effective Hamiltonian has a non-abelian $SU(1,1)$ symmetry, resulting in universal quadratic scaling of the Thouless time with the system size, irrespective of the particle number. This is a consequence of degenerate symmetry multiplets of the subleading eigenvalue of the effective Hamiltonian and is broken by the pairing terms. In the latter case, we numerically find a nontrivial systematic system-size dependence of the Thouless time, in contrast to a related recent study for kicked fermionic chains.
description: 9 pages, 8 figures