Article
Astronomy & Astrophysics
Jan M. Pawlowski, Manuel Scherzer, Christian Schmidt, Felix P. G. Ziegler, Felix Ziesche
Summary: We propose a novel simulation strategy for Yang-Mills theories with a complex coupling, based on the Lefschetz thimble decomposition. This approach can potentially be adapted to QCD at finite density and real-time simulations, offering a solution to sign problems in Monte Carlo calculations within models with complex actions. Our algorithm demonstrates exponential improvements over standard reweighting approaches, despite facing a residual sign problem.
Review
Physics, Multidisciplinary
Andrei Alexandru, Gokce Basar, Paulo F. Bedaque, Neill C. Warrington
Summary: This article reviews a new approach to solve the sign problem based on the complexification of field space and the accompanying mathematical theory. The underlying mathematical ideas and developed algorithms are described, along with successful examples. The article also outlines future research directions, including the growing use of machine learning techniques.
REVIEWS OF MODERN PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Lukas Kades, Martin Gaerttner, Thomas Gasenzer, Jan M. Pawlowski
Summary: Researchers have explored methods for dealing with the sign problem in path integrals with complex actions, and proposed a new approach based on Markov chain Monte Carlo scheme to derive a physical sampling process, addressing the potential fixed point convergence issue in complex Langevin dynamics.
Article
Physics, Nuclear
A. De, J. Kapusta, M. Singh, T. Welle
Summary: In this study, hydrodynamic modeling was conducted to simulate Au-Au collisions from root s(NN) = 7.7 to 200 GeV. The simulations incorporated three innovative components, including the LEXUS-inspired Monte Carlo initial-state model, a crossover equation of state without a critical point, and departure functions derived from the quasiparticle theory of transport coefficients.
Article
Astronomy & Astrophysics
Hiroaki Kouno, Kouji Kashiwa, Takehiro Hirakida
Summary: The study focused on the nonanalyticity and sign problem of the Z(3)-symmetric heavy quark model at low temperature, analyzing the nonanalyticity in relation to the zeros of the grand canonical partition function. The Z(3)-symmetric effective Polyakov-line model (EPLM) and the effects of imaginary quark chemical potential were considered, revealing the significant impact of Z(3) symmetry on the structure of zeros in the microscopic probability density function.
Article
Astronomy & Astrophysics
A. Gomez Nicola, A. Vioque-Rodriguez
Summary: This study revisits chiral perturbation theory at nonzero isospin chemical potential and discusses the effects of new terms and corrections on the free energy density and related observables. The results are consistent with lattice results and support nonzero values for certain low-energy constants. Additionally, an additional constraint is found to preserve a physical condition.
Article
Astronomy & Astrophysics
Matteo Giordano, Kornel Kapas, Sandor D. Katz, Attila Pasztor, Zoltan Tulipant
Summary: We investigate the 2+1-dimensional XY model at nonzero chemical potential on deformed integration manifolds, and present numerical evidence showing exponential reduction of the sign problem with respect to mu 2 and spatial volume. We also introduce a new approach to optimization based on reweighting to reduce computational cost.
Article
Physics, Particles & Fields
Prabal Adhikari, Jens O. Andersen, Martin A. Mojahed
Summary: We studied two-flavor chiral perturbation theory at finite isospin chemical potential and finite temperature, finding that the transition to the pion-condensed phase is second order within the theory's validity range, and calculated the pressure in the symmetric phase.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Jahmall Bersini, Alessandra D'Alise, Francesco Sannino, Matias Torres
Summary: In this study, we investigate the impact of the 0 angle and axion physics on the near conformal dynamics of the large-charge baryon sector with Nf fermions in the fundamental representation in SUo2 thorn gauge theories. We utilize an effective approach with Goldstone and dilaton degrees of freedom, along with topological terms, to examine the influence of different dilaton potentials on the results. By using state-operator correspondence, we calculate the corrections to the would-be conformal dimensions of the lowest large-charge operators as a function of the 0 term and dilaton potential.
Article
Astronomy & Astrophysics
Dibyendu Bala, Olaf Kaczmarek, Rasmus Larsen, Swagato Mukherjee, Gaurang Parkar, Peter Petreczky, Alexander Rothkopf, Johannes Heinrich Weber
Summary: In this study, we investigate the interactions of a static quark-antiquark pair at nonzero temperature using realistic lattice QCD calculations. We compare different analysis methods for extracting the spectral functions and assess their implications for the existence and properties of a well-defined ground state spectral peak.
Article
Astronomy & Astrophysics
A. Turkan, G. Bozkir, K. Azizi
Summary: In the framework of the thermal QCD sum rule, the mass and residue of single heavy spin-1/2 Lambda(Q), Sigma(Q), Xi((Q)'()), and Omega(Q) baryons are studied at finite temperature. The results show stable mass and residue up to certain temperatures, followed by a decrease as temperature increases. Significant changes in mass and residue for bottom and charm channels indicate melting of baryons near the pseudocritical temperature.
Article
Physics, Particles & Fields
Kazem Bitaghsir Fadafan, Jesus Cruz Rojas
Summary: By incorporating higher derivative corrections, we studied the QCD color superconducting phase in the presence of GB gravity, finding a change in critical chemical potential values and the inability to eliminate intrinsic attractive interactions. This study suggests exploring GB corrections to the equation of state for holographic QCD matter.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Multidisciplinary Sciences
Kyle R. Lennon, Gareth H. McKinley, James W. Swan
Summary: The development of data-driven models for complex fluid mechanics is essential for designing soft materials. This study presents a framework that allows rheologists to construct learnable models incorporating important physical information, without being dependent on specific experimental protocols or flow kinematics. These models enable rapid discovery of accurate constitutive equations from limited data and can describe more complex flows. The flexibility of this framework enables its application to a wide range of material systems and engineering problems.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Physics, Particles & Fields
Ignacio Borsa, Daniel de Florian, Ivan Pedron
Summary: This paper presents the second order contributions to the coefficient functions for the parity violating polarized structure functions g(L) and g(4), completing the O(alpha(2)(S)) knowledge on DIS structure functions. The missing O(alpha(2)(S)) pieces are obtained from the known parity conserving unpolarized coefficient functions. A phenomenological analysis is also presented for the phase space region to be explored by the future Electron-Ion Collider.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Optics
Jaroslaw Ryszkiewicz, Miroslaw Brewczyk, Tomasz Karpiuk
Summary: We developed a model for a binary fermionic mixture applicable at nonzero temperatures in the normal phase, and used it to study the dynamics of degenerate Fermi systems under various perturbations. The results show that the ferromagnetic phase appears at higher temperatures and stronger repulsion between the components.
Article
Astronomy & Astrophysics
Z. Fodor, S. D. Katz, D. Sexty, C. Toeroek
Article
Physics, Particles & Fields
Gert Aarts, Felipe Attanasio, Benjamin Jager, Denes Sexty
JOURNAL OF HIGH ENERGY PHYSICS
(2016)
Article
Physics, Particles & Fields
Gert Aarts, Erhard Seiler, Denes Sexty, Ion-Olimpiu Stamatescu
JOURNAL OF HIGH ENERGY PHYSICS
(2017)
Article
Physics, Particles & Fields
Gert Aarts, Lorenzo Bongiovanni, Erhard Seiler, Denes Sexty
JOURNAL OF HIGH ENERGY PHYSICS
(2014)
Article
Physics, Nuclear
Zoltan Fodor, Matteo Giordano, Jana N. Guenther, Kornel Kapas, Sandor D. Katz, Attila Pasztor, Israel Portillo, Claudia Ratti, Denes Sexty, Kalman K. Szabo
Article
Astronomy & Astrophysics
Szabolcs Borsanyi, Denes Sexty
Summary: The study utilizes the Density of States (DoS) method to simulate the topological susceptibility at high temperatures, revealing findings perfectly consistent with a free instanton gas.
Article
Astronomy & Astrophysics
S. Borsanyi, R. Kara, R. Vig, Z. Fodor, D. A. Godzieba, P. Parotto, D. Sexty
Summary: We investigate the first order transition between the confining and the center symmetry breaking phases of the SU(3) Yang-Mills theory. By studying the nonanalytical behavior of the topological susceptibility and its higher cumulant, we make connections to the curvature of the phase diagram in the T - theta plane and to the latent heat.
Article
Astronomy & Astrophysics
S. Borsanyi, R. Kara, Z. Fodor, D. A. Godzieba, P. Parotto, D. Sexty
Summary: We performed large scale simulations to characterize the transition in quenched QCD and found it to be a first order transition. With unprecedented precision, we obtained quantitative results and showed an algorithm that can overcome supercritical slowing down.
Article
Astronomy & Astrophysics
M. Scherzer, D. Sexty, I-O Stamatescu
Article
Astronomy & Astrophysics
M. Scherzer, E. Seiler, D. Sexty, I. -O. Stamatescu
Article
Astronomy & Astrophysics
Denes Sexty
Article
Astronomy & Astrophysics
Manuel Scherzer, Erhard Seiler, Denes Sexty, Ion-Olimpiu Stamatescu
Article
Astronomy & Astrophysics
G. Endrodi, Z. Fodor, S. D. Katz, D. Sexty, K. K. Szabo, Cs. Torok
Proceedings Paper
Physics, Multidisciplinary
Gert Aarts, Felipe Attanasio, Benjamin Jager, Denes Sexty
INTERNATIONAL MEETING: EXCITED QCD, 2016
(2016)
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
