Article
Astronomy & Astrophysics
Zhenning Cai, Yang Kuang, Hong Kiat Tan
Summary: This study investigates the regularization of the complex Langevin method by augmenting the action with a stabilization term and introduces two methods to recover unbiased results. These methods are assessed in SU(X) thorn theory and demonstrate effectiveness through numerical experiments in lattice field theory.
Article
Astronomy & Astrophysics
William Detmold, Gurtej Kanwar, Henry Lamm, Michael L. Wagman, Neill C. Warrington
Summary: Path integral contour deformations have been proposed as a solution to sign and signal-to-noise problems in lattice field theories, particularly those related to phase fluctuations. By defining a family of contour deformations suitable for SU(N) lattice gauge theory, these problems associated with complex actions and observables can be significantly reduced. Experimental results show that this approach can achieve a significant reduction in variance.
Article
Materials Science, Multidisciplinary
Jan-Lukas Wynen, Evan Berkowitz, Stefan Krieg, Thomas Luu, Johann Ostmeyer
Summary: This paper demonstrates that neural networks can be trained to parametrize suitable manifolds for interacting systems with a sign problem, significantly reducing computational costs for small volume systems. The method is particularly effective in solving severe sign problems in nonbipartite systems like the tetrahedron Hubbard model.
Article
Astronomy & Astrophysics
R. J. Hudspith, D. Mohler
Summary: This research presents a tuning method for a relativistic heavy-quark action using machine learning and experimental data, resulting in simulation parameters that can be used for calculations of hadron-hadron scattering.
Article
Astronomy & Astrophysics
Keita Sakai, Shoichi Sasaki
Summary: Removing ultraviolet noise from the gauge fields is crucial for glueball spectroscopy in lattice QCD. The Yang-Mills gradient flow method is explored as an alternative approach for this purpose. The study focuses on the application of the gradient flow technique to the construction of extended glueball operators and proposes using spatial gradient flow to overcome diffusion issues in mass calculations.
Article
Mathematics, Applied
Brian E. Moore
Summary: Exponential integrators based on discrete gradient methods are applied to non-canonical Hamiltonian systems with added linear forcing/damping terms, showing the ability to exactly preserve changes in dynamics in special circumstances. These methods are also symmetric, second order, and linearly stable, demonstrating advantages in accuracy and efficiency over other standard methods when applied to specific systems.
JOURNAL OF SCIENTIFIC COMPUTING
(2021)
Article
Physics, Particles & Fields
David Albandea, Pilar Hernandez, Alberto Ramos, Fernando Romero-Lopez
Summary: The proposed winding HMC algorithm shows improved behavior in overcoming the topological freezing in a two-dimensional U(1) gauge theory and aligns well with analytical predictions for the plaquette and topological susceptibility. It also demonstrates consistency with fixed-topology averages between HMC and wHMC, even in cases where topology is frozen in HMC. Additionally, results of the wHMC algorithm are briefly compared to simulations conducted with master-field of similar sizes.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Luis Albino, Adnan Bashir, Bruno El-Bennich, Eduardo Rojas, Fernando E. Serna, Roberto Correa da Silveira
Summary: This study extends the investigation of transverse Ward-Fradkin-Green-Takahashi identities in QED to the equivalent gauge identities in QCD, revealing the constraints on the transverse quark-gluon vertex and deriving its associated scalar form factors. By studying the functional form of these form factors, significant chiral symmetry breaking and a mass gap in the quark are observed, leading to interesting implications such as the quark condensate and the pion's weak decay constant in the chiral limit.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Multidisciplinary Sciences
Erik Fransson, Mattias Slabanja, Paul Erhart, Goran Wahnstrom
Summary: The perturbative treatments of lattice dynamics are limited for strongly anharmonic systems, metastable crystal structures, and liquids. Molecular dynamics simulations using correlation functions can provide access to the full dynamics of these systems, including dynamical structure factors that bridge the gap to experiment. The dynasor package is a flexible and efficient tool that simplifies the analysis of correlation functions, handling input from major MD packages and allowing for easy extension to support additional codes.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Physics, Fluids & Plasmas
Cole Miles, Benjamin Cohen-Stead, Owen Bradley, Steven Johnston, Richard Scalettar, Kipton Barros
Summary: We present a method to simplify Monte Carlo simulations in the grand canonical ensemble by imposing a fictitious dynamics on the chemical potential. The method runs concurrently with the Monte Carlo sampling of the physical system and corrects the chemical potential based on time-averaged estimates of the mean and variance of the particle number. We performed various tests and found rapid convergence of the chemical potential in all cases, with the inexactness of the tuning algorithm contributing only a minor part of the total measurement error for realistic simulations.
Article
Computer Science, Interdisciplinary Applications
Fabio Cassini, Lukas Einkemmer
Summary: In this paper, a new second order projector-splitting dynamical low-rank algorithm is proposed for solving the full six-dimensional Vlasov-Poisson equations. The method is implemented using the Ensign software framework, and the numerical results demonstrate the significant speedup achieved by running 6D simulations on a single workstation using GPUs.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
Zhonghai Yu, Xiuxia Wang, Chengyan Liu, Yiran Cheng, Zhongwei Zhang, Ruifan Si, Xiaobo Bai, Xiaokai Hu, Jie Gao, Ying Peng, Lei Miao
Summary: Ag8SnSe6-based thermoelectric materials have low carrier concentration and unsatisfactory power factor and thermal conductivity. In this study, the introduction of SnBr2 was used to increase the carrier concentration and decrease the thermal conductivity, leading to improved thermoelectric properties of Ag8SnSe6.
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Mechanics
Manash Protim Boruah, Anik Sarker, Pitambar R. Randive, Sukumar Pati, Kirti Chandra Sahu
Summary: We investigated the dynamics of two immiscible fluids in a cross-junction and observed different dynamics regimes, as well as a transition in regimes due to the interplay of capillarity, viscosity, and wettability. Our results showed that hydrophobic channel surfaces favor a transition from squeezing to dripping behavior, while higher viscosity ratios advance the process of squeezing, necking, and breakage on hydrophobic surfaces. A wettability-capillarity regime map was presented with implications for droplet dispensing devices.
Article
Physics, Multidisciplinary
Muhammad Asif Shakoori, Maogang He, Aamir Shahzad, Misbah Khan
Summary: The effects of uniaxial and biaxial ac electric fields on the structure and transport properties of complex plasmas were investigated using molecular dynamics simulations. The simulation results showed that the external electric field strength and plasma parameter had a significant impact on the phase transition and transport properties of the plasmas.
Article
Astronomy & Astrophysics
Nodoka Yamanaka, Hideaki Iida, Atsushi Nakamura, Masayuki Wakayama
Summary: This study calculates for the first time the scattering cross section between the lightest glueballs in SU(2) pure Yang-Mills theory, identifying them as potential candidates for dark matter. By evaluating the interglueball potential and scattering cross section, the research provides observational constraints on dark matter self-scattering and derives a lower bound on the scale parameter of the SU(2) Yang-Mills theory.
Article
Computer Science, Interdisciplinary Applications
M. A. Clark, Alexei Strelchenko, Alejandro Vaquero, Mathias Wagner, Evan Weinberg
COMPUTER PHYSICS COMMUNICATIONS
(2018)
Article
Physics, Multidisciplinary
David Dudal, Orlando Oliveira, Paulo J. Silva
Article
Multidisciplinary Sciences
C. C. Chang, A. N. Nicholson, E. Rinaldi, E. Berkowitz, N. Garron, D. A. Brantley, H. Monge-Camacho, C. J. Monahan, C. Bouchard, M. A. Clark, B. Joo, T. Kurth, K. Orginos, P. Vranas, A. Walker-Loud
Article
Physics, Particles & Fields
Orlando Oliveira, Paulo J. Silva
EUROPEAN PHYSICAL JOURNAL C
(2019)
Article
Physics, Particles & Fields
David Dudal, Orlando Oliveira, Martin Roelfs, Paulo Silva
Article
Astronomy & Astrophysics
Shirley Weishi Li, Peter Lowdon, Orlando Oliveira, Paulo J. Silva
Article
Astronomy & Astrophysics
Shirley Weishi Li, Peter Lowdon, Orlando Oliveira, Paulo J. Silva
Summary: The existence of BRST symmetry in non-perturbative QCD imposes constraints on the ghost and gluon spectra, but this interconnection is violated in actual data, indicating that continuum and current lattice formulations in Landau gauge represent two distinct realisations of Yang-Mills theory.
Article
Astronomy & Astrophysics
Lee C. Loveridge, Orlando Oliveira, Paulo J. Silva
Summary: By investigating the lattice Landau gauge photon propagator and the average number of Dirac strings, we found that they can be used to identify the confinement-deconfinement transition, which is of first order. In the confined phase, the propagator is finite with a mass gap, and the number of Dirac strings is two orders of magnitude larger compared to the deconfined phase. In the deconfined phase, the theory becomes massless with essentially no Dirac strings present.
Article
Astronomy & Astrophysics
Ayse Kizilersu, Orlando Oliveira, Paulo J. Silva, Jon-Ivar Skullerud, Andre Sternbeck
Summary: The study shows that the quark-gluon vertex has significant infrared strength in the limit of vanishing gluon momentum, with the form factors lambda(1) and lambda(3) being significantly enhanced in the infrared compared to the quenched case. The enhancements are orders of magnitude larger than predicted by one-loop perturbation theory, with only a weak dependence on lattice spacing and quark mass.
Article
Astronomy & Astrophysics
Lee C. Loveridge, Orlando Oliveira, Paulo J. Silva
Summary: In this study, the Landau gauge photon propagator for pure gauge 4D compact QED in confined and deconfined phases was computed for different lattice volumes. The results show that in the confined phase, the propagator is finite at all momentum scales, while in the deconfined phase it approaches a free field propagator as the lattice volume increases. The static potential and average number of Dirac strings in gauge configurations exhibit distinct behaviors in the two phases, with the mass gap in the confined phase leading to a linearly growing static potential.
Article
Astronomy & Astrophysics
Guilherme T. R. Catumba, Orlando Oliveira, Paulo J. Silva
Summary: Lattice tensor representations are used to study the lattice Landau gauge gluon propagator for the pure SU(3) Yang-Mills gauge theory in four dimensions. The analysis quantifies the completeness of the tensor bases considered, the deviations of the lattice results from the continuum theory, and the theoretical uncertainty in the propagator. The results show that the lattice Landau gauge gluon propagator is described by a unique form factor, consistent with the continuum formulation.
Article
Astronomy & Astrophysics
Alexandre F. Falcao, Orlando Oliveira, Paulo J. Silva
Article
Astronomy & Astrophysics
Orlando Oliveira, Paulo J. Silva, Jon-Ivar Skullerud, Andre Sternbeck
Article
Astronomy & Astrophysics
Attilio Cucchieri, David Dudal, Tereza Mendes, Orlando Oliveira, Martin Roelfs, Paulo J. Silva
Article
Astronomy & Astrophysics
Richard C. Brower, Evan Weinberg, M. A. Clark, Alexei Strelchenko
