cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Transverse-momentum-dependent factorization for lattice observables
Creators: name: Vladimirov, Alexey A.
name: Schäfer, Andreas
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: Using soft collinear effective field theory, we derive the factorization theorem for the quasi-transverse-momentum-dependent (quasi-TMD) operator. We check the factorization theorem at one-loop level and compute the corresponding coefficient function and anomalous dimensions. The factorized expression is built from the physical TMD distribution, and a nonperturbative lattice related factor. We demonstrate that lattice related functions cancel in appropriately constructed ratios. These ratios could be used to explore various properties of TMD distributions, for instance, the nonperturbative evolution kernel. A discussion of such ratios and the related continuum properties of TMDs is presented.
Comparison of topological charge definitions in Lattice QCD
Creators: name: Alexandrou, Constantia
name: Athenodorou, Andreas
name: Cichy, Krzysztof
name: Dromard, Arthur
name: Garcia-Ramos, Elena
name: Jansen, Karl
name: Wenger, Urs
name: Zimmermann, Falk
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: In this paper, we show a comparison of different definitions of the topological charge on the lattice. We concentrate on one small-volume ensemble with 2 flavours of dynamical, maximally twisted mass fermions and use three more ensembles to analyze the approach to the continuum limit. We investigate several fermionic and gluonic definitions. The former include the index of the overlap Dirac operator, the spectral flow of the Wilson–Dirac operator and the spectral projectors. For the latter, we take into account different discretizations of the topological charge operator and various smoothing schemes to filter out ultraviolet fluctuations: the gradient flow, stout smearing, APE smearing, HYP smearing and cooling. We show that it is possible to perturbatively match different smoothing schemes and provide a well-defined smoothing scale. We relate the smoothing parameters for cooling, stout and APE smearing to the gradient flow time τ. In the case of hypercubic smearing the matching is performed numerically. We investigate which conditions have to be met to obtain a valid definition of the topological charge and susceptibility and we argue that all valid definitions are highly correlated and allow good control over topology on the lattice.
Ratios of the hadronic contributions to the lepton g−2 from lattice QCD+QED simulations
Creators: name: Giusti, D.
name: Simula, S.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: The ratios among the leading-order (LO) hadronic vacuum polarization (HVP) contributions to the anomalous magnetic moments of an electron, muon, and τ lepton, aHVP,LOℓ=e,μ,τ, are computed using lattice QCD+QED simulations. The results include the effects at order O(α2em) as well as the electromagnetic and strong isospin-breaking corrections at orders O(α3em) and O(α2em(mu−md)), respectively, where (mu−md) is the u- and d-quark mass difference. We employ the gauge configurations generated by the Extended Twisted Mass Collaboration with Nf=2+1+1 dynamical quarks at three values of the lattice spacing (a≃0.062, 0.082, 0.089 fm) with pion masses in the range ≃210–450 MeV. The calculations are based on the quark-connected contributions to the HVP in the quenched-QED approximation, which neglects the charges of the sea quarks. The quark-disconnected terms are estimated from results available in the literature. We show that in the case of the electron-muon ratio the hadronic uncertainties in the numerator and in the denominator largely cancel out, while in the cases of the electron-τ and muon-τ ratios such a cancellation does not occur. For the electron-muon ratio we get Re/μ≡(mμ/me)2(aHVP,LOe/aHVP,LOμ)=1.1456(83) with an uncertainty of ≃0.7%. Our result, which represents an accurate Standard Model (SM) prediction, agrees very well with the estimate obtained using the results of dispersive analyses of the experimental e+e−→ hadrons data. Instead, it differs by ≃2.7 standard deviations from the value expected from present electron and muon (g−2) experiments after subtraction of the current estimates of the QED, electroweak, hadronic light-by-light and higher-order HVP contributions, namely Re/μ=0.575(213). An improvement of the precision of both the experiment and the QED contribution to the electron (g−2) by a factor of ≃2 could be sufficient to reach a tension with our SM value of the ratio Re/μ at a significance level of ≃5 standard deviations.
Effective Values of Komar Conserved Quantities and Their Applications
Creators: name: Modak, Sujoy Kumar
name: Samanta, Saurav
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate the effective Komar angular momentum for the Kerr-Newman (KN) black hole. This result is valid at any radial distance on and outside the black hole event horizon. The effcetive values of mass and angular momentum are then used to derive an identity ($K_{χ^μ}=2ST$) which relates the Komar conserved charge ($K_{χ^μ}$) corresponding to the null Killing vector ($χ^μ$) with the thermodynamic quantities of this black hole. As an application of this identity the generalised Smarr formula for this black hole is derived. This establishes the fact that the above identity is a local form of the inherently non-local generalised Smarr formula.
description: v3, minor modifications over v2; LaTex, 9 pages, no figures, to appear in Int. Jour. Theo. Phys
Counting loopy graphs with given degrees
Creators: name: McKay, Brendan D.
name: Greenhill, Catherine
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 05A16, 05C30

description: Let d=(d_1,d_2,..., d_n) be a vector of non-negative integers. We study the number of symmetric 0-1 matrices whose row sum vector equals d. While previous work has focussed on the case of zero diagonal, we allow diagonal entries to equal 1. When forming the row sum, each diagonal entry is multiplied by a factor of D, where D is 1 or 2. The case D=1 corresponds to enumeration by the usual row sum of matrices. The case D=2 corresponds to enumeration by degree sequence of undirected graphs with loops but no repeated edges, due to the convention that a loop contributes 2 to the degree of its incident vertex. We obtain asymptotically precise formulae for the number of matrices in the sparse range (where, roughly, the maximum row sum is o(n^{1/2})), and in the dense range (where, roughly, the average row sum is proportional to n and the row sums do not vary greatly).
description: Fixed an obvious typo in Thm 1.5
Dielectric breakdown and avalanches at non-equilibrium metal-insulator transitions
Creators: name: Shekhawat, Ashivni
name: Papanikolaou, Stefanos
name: Zapperi, Stefano
name: Sethna, James P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
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: Motivated by recent experiments on the finite temperature Mott transition in VO2 films, we propose a classical coarse-grained dielectric breakdown model where each degree of freedom represents a nanograin which transitions from insulator to metal with increasing temperature and voltage at random thresholds due to quenched disorder. We describe the properties of the resulting non-equilibrium metal-insulator transition and explain the universal characteristics of the resistance jump distribution. We predict that by tuning voltage, another critical point is approached, which separates a phase of "bolt"-like avalanches from percolation-like ones.
description: 4 pages, 3 figures
Representation spaces of pretzel knots
Creators: name: Zentner, Raphael
Publisher: name: arXiv
Year: 2010
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25, 57M27, 57R58

description: We study the representation spaces $R(K;\bf{i})$ as appearing in Kronheimer and Mrowka's framed instanton knot Floer homology, for a class of pretzel knots. In particular, for pretzel knots $P(p,q,r)$ with $p, q, r$ pairwise coprime, these appear to be non-degenerate and comprise representations in SU(2) that are not binary dihedral.
description: 30 pages, 3 figures. This is the published version. It is more general than the previous version regarding the values $p,q,r$. Furthermore, rewritten according after referee's remarks
Pygmy resonance and torus mode within Vlasov dynamics
Creators: name: Urban, Michael
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The pygmy dipole resonance in neutron-rich nuclei is studied within the framework of the Vlasov equation which is solved numerically. The interaction used in the Thomas-Fermi ground state and in the Vlasov equation is derived from an energy functional which correctly describes the equation of state of nuclear matter and neutron matter. It is found that the pygmy resonance appears in the electric dipole response of all nuclei with strong neutron excess, the energies and transition probabilities being in reasonable agreement with experimental results. Since the Vlasov equation does not account for any shell effects, this indicates that the existence of the pygmy resonance is a generic phenomenon and does not rely on the specific shell structure. Besides the electric dipole response, the isoscalar toroidal response is calculated. The transition densities and velocity fields are discussed. A comparison of the peak positions and velocity fields suggests that the pygmy resonance can be identified with one of the low-lying modes excited by the isoscalar toroidal operator.
description: 13 pages, 14 figures; v2: new results and discussion added; v3: description of numerical method clarified
Annihilator varieties, highest derivatives, Whittaker functionals, and rank for unitary representations of GL(n,R)
Creators: name: Gourevitch, Dmitry
name: Sahi, Siddhartha
Publisher: name: arXiv
Year: 2011
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 22E46, 22E47, 22E50

description: In this paper we study irreducible unitary representations of GL(n,R) and prove a number of results. Our first result establishes a precise connection between the annihilator of a representation and the existence of degenerate Whittaker functionals, for both smooth and K-finite vectors, thereby generalizing results of Kostant, Matumoto and others. Our second result relates the annihilator to the sequence of highest derivatives, as defined in this setting by one of the authors. Based on those results, we suggest a new notion of rank of a smooth admissible representation of GL(n,R), which for unitarizable representations refines Howe's notion of rank. Our third result computes the highest derivatives for (almost) all unitary representations in terms of the Vogan classification. We also indicate briefly the analogous results over complex and p-adic fields.
description: 21 pages, no figures. v2: minor changes in the exposition, version accepted to Selecta Mathematica
Massive kite diagrams with elliptics
Creators: name: Bezuglov, M. A.
name: Onishchenko, A. I.
name: Veretin, O. L.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: We present the results for two-loop massive kite master integrals with elliptics in terms of iterated in-tegrals with algebraic kernels. The key ingredients are new integral representations for sunset subgraphs in d=4 −2εand d=2 −2εdimensions together with differential equations for considered kite master integrals in A +Bεform. The obtained results can be easily generalized to all orders in ε-expansion and show that the class of functions defined as iterated integrals with algebraic kernels may be large enough for writing down results for a large class of massive Feynman diagrams.
Some LRS Bianchi-I String Cosmological Models with Variable Deceleration Parameter
Creators: name: Yadav, Anil Kumar
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The present study deals with LRS Bianchi type I cosmological model representing massive string. The energy-momentum tensor for such string as formulated by Letelier (1983) is used to construct massive string cosmological models for which we assume that the shear scalar ($σ$) is proportional to the expansion scalar ($θ$). The study reveals that massive strings dominate the early Universe. The strings eventually disappear from the Universe for sufficiently large time, which is in agreement with the current astronomical observations. Some physical and geometrical behaviour of models are also discussed.
description: 11 pages, 6 figures, Unlike the previous version the new one contains the variable DP
On the pulsating strings in AdS_5 x T^{1,1}
Creators: name: Arnaudov, D.
name: Dimov, H.
name: Rashkov, R. C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the class of pulsating strings in AdS_5 x T^{1,1}. Using a generalized ansatz for pulsating string configurations we find new solutions of this class. Further we semiclassically quantize the theory and obtain the first correction to the energy. The latter, due to AdS/CFT correspondence, is supposed to give the anomalous dimensions of operators in the dual N=1 superconformal gauge field theory.
description: 12 pages, improvements made, references added
Addendum to: Light-cone distribution amplitudes of pseudoscalar mesons from lattice QCD
Creators: name: Bali, Gunnar S.
name: Braun, Vladimir M.
name: Bürger, Simon
name: Göckeler, Meinulf
name: Gruber, Michael
name: Hutzler, Fabian
name: Korcyl, Piotr
name: Schäfer, Andreas
name: Sternbeck, André
name: Wein, Philipp
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: We update our lattice determination of the two lowest Gegenbauer moments of the leading-twist pion and kaon light-cone distribution amplitudes [1] using the recently calculated three-loop matching factors for the conversion from the RI0/SMOM to the MS scheme [2, 3]. We find a�2 = 0.116+19 −20 for the pion, aK1 = 0.0525+31 −33 and aK2 = 0.106+15 −16 for the kaon. Updated plots can be found in the appendix in the arXiv submission.
Huisgen’s Cycloaddition Reactions: A Full Perspective
Creators: name: Mommahed Heravi, Majid
name: Tamimi, Mehrnoush
name: Yahyavi, Hoda
name: Hosseinnejad, Tayebeh
Publisher: name: figshare
Year: 2022
Subjects: subject: 30302 Nanochemistry and Supramolecular Chemistry
subject: FOS: Chemical sciences
subject: 30701 Quantum Chemistry
subject: 39904 Organometallic Chemistry
subject: Organic Chemistry
subject: 30502 Natural Products Chemistry
subject: 30599 Organic Chemistry not elsewhere classified
subject: 30205 Non-metal Chemistry
subject: Nuclear Chemistry
subject: 30504 Organic Green Chemistry
subject: 30303 Optical Properties of Materials

description: Huisgen cycloaddition reaction has been originally utilized for the synthesis of 1, 2, 3-triazoles regioisomers. In this review, its stereochemistry and also mechanistical features of Huisgen cycloaddition reaction based on the quantum chemistry are highlighted.Thermal and copper catalyzed approaches to the synthesis of 1,2,3- triazoles will also be re-visited. Finally, the synthesis of alternative region-isomer, 1,5-disubstituted-1,2,3-triazoles under ruthenium catalysis and transition metal free conditions is described.
Detection of Spatial Changes using Spatial Data Mining
Creators: name: Kodge, B. G.
name: Hiremath, P. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences
subject: H.2.8; I.5.3

description: The Change detection based on analysis and samples are analyzed. Land use/cover change detection based on SDM is discussed.
description: This paper has been withdrawn by the author
On the Entropy of a Family of Random Substitutions
Creators: name: Nilsson, Johan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 68R15, 05A16, 37B10

description: The generalised random Fibonacci chain is a stochastic extension of the classical Fibonacci substitution and is defined as the rule mapping $0\mapsto 1$ and $1 \mapsto 1^i01^{m-i}$ with probability $p_i$, where $p_i\geq 0$ with $\sum_{i=0}^m p_i=1$, and where the random rule is applied each time it acts on a 1. We show that the topological entropy of this object is given by the growth rate of the set of inflated generalised random Fibonacci words.
description: A more appropriate tile and minor misprints corrected, compared to the previous version
Gluon field digitization via group space decimation for quantum computers
Creators: name: Ji, Yao
name: Lamm, Henry
name: Zhu, Shuchen
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: Efficient digitization is required for quantum simulations of gauge theories. Schemes based on discrete subgroups use fewer qubits at the cost of systematic errors. We systematize this approach by deriving a single plaquette action for approximating general continuous gauge groups through integrating out field fluctuations. This provides insight into the effectiveness of these approximations, and how they could be improved. We accompany the scheme by simulations of pure gauge over the largest discrete subgroup of SU(3) up to the third order.
Separation of Quark Flavors Using Deeply Virtual Compton Scattering Data
Creators: name: Čuić, Marija
name: Kumerički, Krešimir
name: Schäfer, Andreas
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: Using the available data on deeply virtual Compton scattering (DVCS) off protons and utilizing neural networks enhanced by the dispersion relation constraint, we determine six out of eight leading Compton form factors in the valence quark kinematic region. Furthermore, adding recent data on DVCS off neutrons, we separate contributions of up and down quarks to the dominant form factor, thus paving the way towards a three-dimensional picture of the nucleon.
Moments n = 2 and n = 3 of the Wilson twist-two operators at three loops in the RI′/SMOM scheme
Creators: name: Kniehl, Bernd A.
name: Veretin, Oleg L.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: We study the renormalization of the matrix elements of the twist-two non-singlet bilinear quark operators, contributing to the and moments of the structure functions, at next-to-next-to-next-to-leading order in QCD perturbation theory at the symmetric subtraction point. This allows us to obtain conversion factors between the scheme and the regularization-invariant symmetric momentum subtraction (RI/SMOM, RI′/SMOM) schemes. The obtained results can be used to reduce errors in determinations of moments of structure functions from lattice QCD simulations. The results are given in Landau gauge.
A counterexample to the Hirsch conjecture
Creators: name: Santos, Francisco
Publisher: name: arXiv
Year: 2010
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 52B05, 52B55, 90C05

description: The Hirsch Conjecture (1957) stated that the graph of a $d$-dimensional polytope with $n$ facets cannot have (combinatorial) diameter greater than $n-d$. That is, that any two vertices of the polytope can be connected by a path of at most $n-d$ edges. This paper presents the first counterexample to the conjecture. Our polytope has dimension 43 and 86 facets. It is obtained from a 5-dimensional polytope with 48 facets which violates a certain generalization of the $d$-step conjecture of Klee and Walkup.
description: 28 pages, 10 Figures: Changes from v2: Minor edits suggested by referees. This version has been accepted in the Annals of Mathematics
Calculation of transverse momentum dependent distributions beyond the leading power
Creators: name: Moos, Valentin
name: Vladimirov, Alexey
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: We compute the contribution of twist-2 and twist-3 parton distribution functions to the small-b expansion for transverse momentum dependent (TMD) distributions at all powers of b. The computation is done by the twist-decomposition method based on the spinor formalism for all eight quark TMD distributions. The newly computed terms are accompanied by the prefactor (M2b2)n and represent the target-mass corrections to the resummed cross-section. For the first time, a non-trivial expression for the pretzelosity distribution is derived.
Stressed Cooper pairing in QCD at high isospin density: effective Lagrangian and random matrix theory
Creators: name: Kanazawa, Takuya
name: Wettig, Tilo
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: Chiral Lagrangians, Phase Diagram of QCD, Matrix Models, Spontaneous Symmetry Breaking
subject: 530 Physik

description: We generalize QCD at asymptotically large isospin chemical potential to an arbitrary even number of flavors. We also allow for small quark chemical potentials, which stress the coincident Fermi surfaces of the paired quarks and lead to a sign problem in Monte Carlo simulations. We derive the corresponding low-energy effective theory in both p- and ε-expansion and quantify the severity of the sign problem. We construct the random matrix theory describing our physical situation and show that it can be mapped to a known random matrix theory at low baryon density so that new insights can be gained without additional calculations. In particular, we explain the Silver Blaze phenomenon at high isospin density. We also introduce stressed singular values of the Dirac operator and relate them to the pionic condensate. Finally we comment on extensions of our work to two-color QCD.
Effective thermodynamics of strongly coupled qubits
Creators: name: Williams, Nathan S.
name: Hur, Karyn Le
name: Jordan, Andrew N.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Interactions between a quantum system and its environment at low temperatures can lead to violations of thermal laws for the system. The source of these violations is the entanglement between system and environment, which prevents the system from entering into a thermal state. On the other hand, for two-state systems, we show that one can define an effective temperature, placing the system into a `pseudo-thermal' state where effective thermal laws are upheld. We then numerically explore these assertions for an n-state system inspired by the spin-boson environment.
description: 9 pages, 3 figures
Anomalous continuous symmetries and quantum topology of Goldstone modes
Creators: name: Manjunath, Naren
name: Else, Dominic V.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider systems in which a continuous symmetry $G$, which may be anomalous, is spontaneously broken to an anomaly-free subgroup $H$ such that the effective action for the Goldstone modes contains topologically non-trivial terms. If the original system has trivial $G$ anomaly, it is known that the possible topological terms are fully determined by SPT or SET invariants of the residual $H$ symmetry. Here we address the more general setting in which the $G$ symmetry has an anomaly. We argue that in general, the appropriate concept to consider is the "compatibility relation" between the Goldstone invariants and the $G$ anomaly. In the case where the Goldstone modes can be gapped out to obtain invertible families (i.e. without any topological order), we give an explicit mathematical scheme to construct the desired compatibility relation. We also address the case where gapping out the Goldstone modes leads to a family of topologically ordered states. We discuss several examples including the canonical Thouless pump, the quantum Hall ferromagnet, pumps arising from breaking $\text{U}(1)$ symmetry at the boundary of topological insulators in two and three dimensions, and pumps classified by the higher Chern number.
description: 40 + 5 pages
Chebyshev constants for the unit circle
Creators: name: Ambrus, Gergely
name: Ball, Keith M.
name: Erdélyi, T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Metric Geometry (math.MG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30C15, 52A40

description: It is proven that for any system of n points z_1, ..., z_n on the (complex) unit circle, there exists another point z of norm 1, such that $$\sum 1/|z-z_k|^2 \leq n^2/4.$$ Equality holds iff the point system is a rotated copy of the nth unit roots. Two proofs are presented: one uses a characterisation of equioscillating rational functions, while the other is based on Bernstein's inequality.
description: 11 pages
Periodic Anderson model with correlated conduction electrons: variational and exact diagonalization study
Creators: name: Hagymasi, I.
name: Itai, K.
name: Solyom, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate an extended version of the periodic Anderson model (the so-called periodic Anderson-Hubbard model) with the aim to understand the role of interaction between conduction electrons in the formation of the heavy-fermion and mixed-valence states. Two methods are used: (i) variational calculation with the Gutzwiller wave function optimizing numerically the ground-state energy and (ii) exact diagonalization of the Hamiltonian for short chains. The f-level occupancy and the renormalization factor of the quasiparticles are calculated as a function of the energy of the f-orbital for a wide range of the interaction parameters. The results obtained by the two methods are in reasonably good agreement for the periodic Anderson model. The agreement is maintained even when the interaction between band electrons, U_d, is taken into account, except for the half-filled case. This discrepancy can be explained by the difference between the physics of the one- and higher dimensional models. We find that this interaction shifts and widens the energy range of the bare f-level, where heavy-fermion behavior can be observed. For large enough U_d this range may lie even above the bare conduction band. The Gutzwiller method indicates a robust transition from Kondo insulator to Mott insulator in the half-filled model, while U_d enhances the quasi-particle mass when the filling is close to half filling.
description: 14 pages, 15 figures, 2 tables, extended version, Accepted for publication in PRB
Generalized Geologic Map for Land-Use Planning: Johnson County, Kentucky
Creators: name: Carey, Daniel I.
Publisher: name: Kentucky Geological Survey, University of Kentucky
Year: 2007

description: Abstract:
This map is not intended to be used for selecting individual sites. Its purpose is to inform land-use planners, government officials, and the public in a general way about geologic bedrock conditions that affect the selection of sites for various purposes. The properties of thick soils may supercede those of the underlying bedrock and should be considered on a site-to-site basis. At any site, it is important to understand the characteristics of both the soils and the underlying rock.
Statistically induced Phase Transitions and Anyons in 1D Optical Lattices
Creators: name: Keilmann, Tassilo
name: Lanzmich, Simon
name: McCulloch, Ian
name: Roncaglia, Marco
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Other Condensed Matter (cond-mat.other)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Anyons - particles carrying fractional statistics that interpolate between bosons and fermions - have been conjectured to exist in low dimensional systems. In the context of the fractional quantum Hall effect (FQHE), quasi-particles made of electrons take the role of anyons whose statistical exchange phase is fixed by the filling factor. Here we propose an experimental setup to create anyons in one-dimensional lattices with fully tuneable exchange statistics. In our setup, anyons are created by bosons with occupation-dependent hopping amplitudes, which can be realized by assisted Raman tunneling. The statistical angle can thus be controlled in situ by modifying the relative phase of external driving fields. This opens the fascinating possibility of smoothly transmuting bosons via anyons into fermions and of inducing a phase transition by the mere control of the particle statistics as a free parameter. In particular, we demonstrate how to induce a quantum phase transition from a superfluid into an exotic Mott-like state where the particle distribution exhibits plateaus at fractional densities.
description: 8 pages, 5 figures
The Sensitivity to initial conditions of the Co-orbital outcomes of Lunar Ejecta
Creators: name: Castro-Cisneros, Jose Daniel
name: Malhotra, Renu
name: Rosengren, Aaron J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Lunar ejecta, produced by meteoroidal impacts, have been proposed for the origin of the near-Earth asteroid (469219) Kamo'oalewa, supported by its unusually Earth-like orbit and L-type reflectance spectrum (Sharkey et al., 2021). In a recent study (Castro-Cisneros et al. 2023), we found with N-body numerical simulations that the orbit of Kamo'oalewa is dynamically compatible with rare pathways of lunar ejecta captured into Earth's co-orbital region, persistently transitioning between horseshoe and quasi-satellite (HS-QS) states. Subsequently, Jiao et al. (2024) found with hydrodynamic and N-body simulations that the geologically young lunar crater Giordano Bruno generated up to 300 Kamo'oalewa-sized escaping fragments, and up to three of those could have become Earth co-orbitals. However, these results are based upon specific initial conditions of the major planets in the Solar System, close to the current epoch. In particular, over megayear time spans, Earth's eccentricity undergoes excursions up to five times its current value, potentially affecting the chaotic orbital evolution of lunar ejecta and their capture into Earth's co-orbital regions. In the present work, we carry out additional numerical simulations to compute the statistics of co-orbital outcomes across different launch epochs, representative of the full range of Earth's eccentricity values. Our main results are as follows: Kamo'oalewa-like co-orbital outcomes of lunar ejecta vary only slightly across the range of Earth's orbital eccentricity, suggesting no privileged ejecta launching epoch for such objects; the probability of co-orbital outcomes decreases rapidly with increasing launch speed, but long-lived HS-QS states are favored at higher launch speeds.
Stability Of contact discontinuity for steady Euler System in infinite duct
Creators: name: Bae, Myoungjean
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35J15, 35J25, 35J62, 35R35, 76H05, 76N10

description: In this paper, we prove structural stability of contact discontinuities for full Euler system.
Azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons
Creators: name: Airapetian, A.
name: Akopov, N.
name: Akopov, Z.
name: Aschenauer, E. C.
name: Augustyniak, W.
name: Avakian, R.
name: Bacchetta, A.
name: Belostotski, S.
name: Bryzgalov, V.
name: Capitani, G. P.
name: Cisbani, E.
name: Ciullo, G.
name: Contalbrigo, M.
name: Deconinck, W.
name: De Leo, R.
name: De Sanctis, E.
name: Diefenthaler, M.
name: Di Nezza, P.
name: Düren, M.
name: Elbakian, G.
name: Ellinghaus, F.
name: Fantoni, A.
name: Felawka, L.
name: Gavrilov, G.
name: Gharibyan, V.
name: Hasch, D.
name: Holler, Y.
name: Ivanilov, A.
name: Jackson, H. E.
name: Joosten, S.
name: Kaiser, R.
name: Karyan, G.
name: Kinney, E.
name: Kisselev, A.
name: Kozlov, V.
name: Kravchenko, P.
name: Lagamba, L.
name: Lapikás, L.
name: Lehmann, I.
name: Lenisa, P.
name: Lorenzon, W.
name: Manaenkov, S. I.
name: Marianski, B.
name: Marukyan, H.
name: Miyachi, Y.
name: Movsisyan, A.
name: Muccifora, V.
name: Naryshkin, Y.
name: Nass, A.
name: Nazaryan, G.
name: Nowak, W.-D.
name: Pappalardo, L. L.
name: Reimer, P. E.
name: Reolon, A. R.
name: Riedl, C.
name: Rith, K.
name: Rosner, G.
name: Rostomyan, A.
name: Rubin, J.
name: Ryckbosch, D.
name: Schäfer, Andreas
name: Schnell, G.
name: Seitz, B.
name: Shibata, T.-A.
name: Shutov, V.
name: Statera, M.
name: Terkulov, A.
name: Tytgat, M.
name: Van Haarlem, Y.
name: Van Hulse, C.
name: Veretennikov, D.
name: Vilardi, I.
name: Yaschenko, S.
name: Zeiler, D.
name: Zihlmann, B.
name: Zupranski, P.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized protons is presented. These asymmetries include the previously published HERMES results on Collins and Sivers asymmetries, the analysis of which has been extended to include protons and antiprotons and also to an extraction in a three-dimensional kinematic binning and enlarged phase space. They are complemented by corresponding results for the remaining four single-spin and four double-spin asymmetries allowed in the one-photon-exchange approximation of the semi-inclusive deep-inelastic scattering process for target-polarization orientation perpendicular to the direction of the incoming lepton beam. Among those results, significant non-vanishing cos (ϕ−ϕS) modulations provide evidence for a sizable worm-gear (II) distribution, gq1T(x,p2T). Most of the other modulations are found to be consistent with zero with the notable exception of large sin (ϕS) modulations for charged pions and K+.
Locally parabolic subgroups in Coxeter groups of arbitrary ranks
Creators: name: Nuida, Koji
Publisher: name: arXiv
Year: 2010
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F55 (Primary) 20F50, 20E34 (Secondary)

description: Despite the significance of the notion of parabolic closures in Coxeter groups of finite ranks, the parabolic closure is not guaranteed to exist as a parabolic subgroup in a general case. In this paper, first we give a concrete example to clarify that the parabolic closure of even an irreducible reflection subgroup of countable rank does not necessarily exist as a parabolic subgroup. Then we propose a generalized notion of "locally parabolic closure" by introducing a notion of "locally parabolic subgroups", which involves parabolic ones as a special case, and prove that the locally parabolic closure always exists as a locally parabolic subgroup. It is a subgroup of parabolic closure, and we give another example to show that the inclusion may be strict in general. Our result suggests that locally parabolic closure has more natural properties and provides more information than parabolic closure. We also give a result on maximal locally finite, locally parabolic subgroups in Coxeter groups, which generalizes a similar well-known fact on maximal finite parabolic subgroups.
description: 7 pages; (v2) 11 pages, examples added, main theorem slightly updated (v3) references updated, minor changes performed, to appear in Journal of Algebra
Running Coupling Constant from Position-Space Current-Current Correlation Functions in Three-Flavor Lattice QCD
Creators: name: Calì, Salvatore
name: Cichy, Krzysztof
name: Korcyl, Piotr
name: Simeth, Jakob
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: In this Letter, we provide a determination of the coupling constant in three-flavor quantum chromodynamics (QCD), α¯¯¯¯¯¯MSs(μ), for ¯¯¯¯¯¯MS renormalization scales μ∈(1,2) GeV. The computation uses gauge field configuration ensembles with O(a)-improved Wilson-clover fermions generated by the Coordinated Lattice Simulations (CLS) consortium. Our approach is based on current-current correlation functions and has never been applied before in this context. We convert the results perturbatively to the QCD Λ parameter and obtain ΛNf=3¯¯¯¯¯¯MS=342±17 MeV, which agrees with the world average published by the Particle Data Group and has competing precision. The latter was made possible by a unique combination of state-of-the-art CLS ensembles with very fine lattice spacings, further reduction of discretization effects from a dedicated numerical stochastic perturbation theory simulation, combining data from vector and axial-vector channels, and matching to high-order perturbation theory.
From the Embedding Theory to General Relativity in a result of inflation
Creators: name: Paston, S. A.
name: Sheykin, A. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the embedding theory being a formulation of the gravitation theory where the independent variable is the embedding function for the four-dimensional space-time in a flat ambient space. We do not impose additional constraints which are usually used to remove from the theory the extra solutions not being the solutions of Einstein equations. In order to show the possibility of automatic removal of these extra solutions we analyze the equations of the theory, assuming an inflation period during the expansion of the Universe. In the framework of FRW symmetry we study the initial conditions for the inflation, and we show that after its termination the Einstein equations begin to satisfy with a very high precision. The properties of the theory equations allow us to suppose with confidence that the Einstein equations will satisfy with enough precision out of the framework of FRW symmetry as well. Thus the embedding theory can be considered as a theory of gravity which explains observed facts without any additional modification of it and we can use this theory in a flat space when we try to develop a quantum theory of gravity.
description: LaTeX, 18 pages; in this version some references was added
Self-Contained Definition of the Collins-Soper Kernel
Creators: name: Vladimirov, Alexey A.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: The rapidity anomalous dimension (RAD), or Collins-Soper kernel, defines the scaling properties of transverse momentum dependent distributions and can be extracted from the experimental data. I derive a self-contained nonperturbative definition that represents RAD without reference to a particular process. This definition makes possible exploration of the properties of RAD by theoretical methods on one side, and the properties of QCD vacuum with collider measurements on another side. To demonstrate these possibilities, I compute the power correction to RAD, its large-b asymptotic, and compare these estimations with recent phenomenological extractions.
Intraday Online Information Demand and its Relationship with REIT Prices
Creators: name: Kandlbinder, Katrin
name: Dietzel, Marian
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: Google Trends, REIT, intraday, trading strategy, search volumes
subject: 330 Wirtschaft

description: In this study we develop a fictional trading strategy based on Google search volumes on an hourly basis for the MSCI U.S. REIT Index to show whether there is a relationship between intraday online search interest and REIT market movements. Furthermore, we investigate in which market circumstances this trading strategy has the best predicting abilities and examine the controversial questions of correlation and causality between search volumes and prices. The results indicate that search volumes have the ability to predict intraday REIT market movements, as the Google trading strategy achieves an outperformance of 7.37 percentage points on average compared to a buy-and-hold strategy of the underlying REIT. In falling market phases the performance results of the Google trading strategy are substantially better than in rising market phases. On average, there is a statistically significant negative correlation of -0.11 and a causality flow from prices to search volumes. The findings yield new insights into the information-gathering behavior and are therefore useful for understanding and anticipating the relationship between market information demand and REIT price movements.
NLO matrix elements and truncated showers
Creators: name: Hoeche, Stefan
name: Krauss, Frank
name: Schonherr, Marek
name: Siegert, Frank
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this publication, an algorithm is presented that combines the ME+PS approach to merge sequences of tree-level matrix elements into inclusive event samples with the POWHEG method, which combines exact next-to-leading order matrix element results with the parton shower. It was developed in parallel to the MENLOPS technique and has been implemented in the event generator Sherpa. The benefits of this approach are exemplified by some first predictions for a number of processes, namely the production of jets in e+ e- annihilation, in deep-inelastic ep scattering, in association with single W, Z or Higgs bosons, and with vector boson pairs at hadron colliders.
description: 34 pages, 24 figures, v2 as accepted for publication in JHEP: extended discussion of unitarity violations
The Determinants of Executive Compensation in US REITs: Performance vs. Corporate Governance Factors
Creators: name: Ascherl, Claudia
name: Schrand, Liesa
name: Schäfers, Wolfgang
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: Compensation, performance, CEO power, financial crisis, REITs
subject: 330 Wirtschaft

description: The paper examines whether executive compensation packages within the US REIT industry are determined merely by performance or also by CEO power mechanisms that have an essential influence on board-level negotiations. We offer original insights into management compensation arrangements during and after the financial crisis. The relative importance of cash bonuses in CEO compensation contracts has more than halved after the crisis. Simultaneously, after the financial crisis, equity-based compensation became increasingly important. Concerning the pay-for-performance link, our results show no relationship during the financial crisis. However, after the crisis, we find a strong significant link between remuneration packages and corporate success.
Harmonic and temporal structure of electric organ discharges of the wave-type in Amazonian knifefishes (Gymnotiformes)
Creators: name: Kramer, Bernd
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: 570 Biowissenschaften, Biologie

description: bei der neuen Version des Eintrags wurde das Addendum von 2021 hinzugefügt
TWO!EARS Deliverable D4.1 - Feedback-loop selection and listing (WP4: Active listening, feedback loops & integration of cross-modal information; FP7-ICT-2013-C TWO!EARS FET-Open Project 618075)
Creators: name: Blauert, Jens
name: Walther, Thomas
Publisher: name: Zenodo
Year: 2019

description: As stated in the project proposal, Two!Ears is going to challenge current thinking in auditory modeling by replacing common paradigms in this field with a systemic approach, whereby human listeners are regarded as multi-modal agents that develop their concept of the world by exploratory interaction. The goal of Two!Ears is to develop an intelligent, computational model of active auditory perception and experience in a multi-modal context. The resulting system framework will form a structural link from binaural perception to judgment and action, realized by interleaved signal-driven (bottom-up) and hypothesis-driven (top-down) feedback processing within an innovative expert-system architecture.

The main objective of WP4 in this context is to set up a framework that endows the Two!Ears system with active-listening capabilities. To capture bottom-up data processing as well as the top-down mechanisms as required for active listening tasks, the proposed framework must host suitable feedback loops. It is the general task of WP4 to design an appropriate system architecture for this requirement, investigate meaningful feedback paths, implement them, and finally evaluate them with respect to their functionalities. Input from modalities other than the auditory one will also be considered as a source of feedback information, particularly, position, direction of speed of head-&-torso movements (proprioceptive and sensorimotor input), further, identified optical objects (visual input).

WP4 is split into five tasks. This deliverable mainly entails our advance on the key task for the current project period, namely, task 4.1. As this task consists of several sub-tasks, the remainder of our report is organized as follows.

	D4.1, part B A consolidated literature survey regarding “active listening” has been compiled, summarizing available information about the mechanics and functions of feedback in the auditory system. Also, multi-modal approaches have been reviewed and evaluated with regard to their value for Two!Ears. Herein, particular focus has been put on the two project-specific proof-of-concept applications, that is search-&-rescue and quality of experience.
	D4.1, part C Possible and meaningful feedback loops have been identified that might be set up within the actual Two!Ears model framework, resulting in an updated list of entry ports for feedback and a list of sources for feedback information.
	D4.1, part D A supporting document that describes the planned or realized integration of feedback-related concepts and mechanisms in the current Two!Ears architecture. Though such supporting information is not a mandatory component of D4.1, it was added to provide additional explanations regarding key achievements in this project period.