arXiv - PHYS - High Energy Physics - Lattice最新文献_第5页

Hot QCD matter around the chiral crossover: a lattice study with $O(a)$-improved Wilson fermions 手性交叉点附近的热QCD物质：用$O(a)$改进的威尔逊费米子进行的晶格研究

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-07-01 DOI: arxiv-2407.01657

Ardit Krasniqi, Marco Cè, Renwick J. Hudspith, Harvey B. Meyer

{"title":"Hot QCD matter around the chiral crossover: a lattice study with $O(a)$-improved Wilson fermions","authors":"Ardit Krasniqi, Marco Cè, Renwick J. Hudspith, Harvey B. Meyer","doi":"arxiv-2407.01657","DOIUrl":"https://doi.org/arxiv-2407.01657","url":null,"abstract":"Using lattice QCD simulations with $O(a)$-improved Wilson quarks and physical\u0000up, down and strange quark masses, we investigate the properties of thermal QCD\u0000matter at the temperatures $T={128,154,192}mathrm{MeV}$ with a fixed lattice\u0000spacing $a=0.064mathrm{fm}$ and volume $V=(6.1text{fm})^3$. We find that the\u0000pion quasiparticle, defined as the low-energy pole in the two-point function of\u0000the axial charge, becomes lighter as the temperature increases and give an\u0000argument based on hydrodynamics as to why the pole becomes purely diffusive\u0000above the chiral crossover. We study the thermal modification of the isovector\u0000vector spectral function using the Backus-Gilbert method, finding an\u0000enhancement at low energies and a depletion at energies around\u0000$1mathrm{GeV}$.The analogous study of the axial-vector channel reveals a\u0000larger enhancement at energies below $1mathrm{GeV}$, and we show that these\u0000findings are consistent with rigorous spectral sum rules. The difference\u0000between vector and axial-vector correlators, an order parameter for chiral\u0000symmetry, turns out to be overall suppressed by more than an order of magnitude\u0000at the crossover.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141521230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum Simulation with Gauge Fixing: from Ising Lattice Gauge Theory to Dynamical Flux Model 有量子固定的量子模拟：从伊星格量子理论到动态通量模型

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-07-01 DOI: arxiv-2407.01422

Junsen Wang, Xiangxiang Sun, Wei Zheng

{"title":"Quantum Simulation with Gauge Fixing: from Ising Lattice Gauge Theory to Dynamical Flux Model","authors":"Junsen Wang, Xiangxiang Sun, Wei Zheng","doi":"arxiv-2407.01422","DOIUrl":"https://doi.org/arxiv-2407.01422","url":null,"abstract":"Quantum simulation of synthetic dynamic gauge field has attracted much\u0000attentions in recent years. There are two traditional ways to simulate gauge\u0000theories. One is to directly simulate the full Hamiltonian of gauge theories\u0000with local gauge symmetries. And the other is to engineer the projected\u0000Hamiltonian in one gauge subsector. In this work, we provide the third way\u0000towards the simulation of gauge theories based on emph{gauge fixing}. To\u0000demonstrate this concept, we fix the gauge of an Ising lattice gauge field\u0000coupled with spinless fermions on a ladder geometry. After the gauge fixing,\u0000this gauge theory is reduced to a simpler model, in which fermions hop on a\u0000ladder with a fluctuating dynamical $mathbb{Z}_{2}$ flux. Then we shows that\u0000this model can be realized via Floquet engineering in ultracold atomic gases.\u0000By analytical and numerical studies of this dynamical flux model, we deduce\u0000that there is confinement to deconfinement phase transition in the original\u0000unfixed gauge theory. This work paves the way to quantum simulate lattice gauge\u0000theory using the concept of gauge fixing, relevant both for condensed matter\u0000and high energy physics.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"184 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141521231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Ising Model on $mathbb S^2$ $mathbb S^2$ 上的伊辛模型

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-29 DOI: arxiv-2407.00459

Richard C. Brower, Evan K. Owen

引用次数: 0

Exact Fisher zeros and thermofield dynamics across a quantum critical point 跨越量子临界点的精确费雪零点和热场动力学

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-27 DOI: arxiv-2406.18981

Yang Liu, Songtai Lv, Yuchen Meng, Zefan Tan, Erhai Zhao, Haiyuan Zou

{"title":"Exact Fisher zeros and thermofield dynamics across a quantum critical point","authors":"Yang Liu, Songtai Lv, Yuchen Meng, Zefan Tan, Erhai Zhao, Haiyuan Zou","doi":"arxiv-2406.18981","DOIUrl":"https://doi.org/arxiv-2406.18981","url":null,"abstract":"By setting the inverse temperature $beta$ loose to occupy the complex plane,\u0000Michael E. Fisher showed that the zeros of the complex partition function $Z$,\u0000if approaching the real $beta$ axis, reveal a thermodynamic phase transition.\u0000More recently, Fisher zeros have been used to mark the dynamical phase\u0000transition in quench dynamics. The success of Fisher zeros however seems\u0000limited, and it is unclear how they can be employed to shed light on quantum\u0000phase transitions or the non-unitary dynamics of open quantum systems. Here we\u0000answer this question by a comprehensive analysis of the (analytically\u0000continued) one-dimensional transverse field Ising model. We exhaust all the\u0000Fisher zeros to show that in the thermodynamic limit they congregate into a\u0000remarkably simple pattern in the form of continuous open or closed lines. These\u0000Fisher lines evolve smoothly as the coupling constant is tuned, and a\u0000qualitative change identifies the quantum critical point. By exploiting the\u0000connection between $Z$ and the thermofield double states, we obtain analytical\u0000expressions for the short- and long-time dynamics of the survival amplitude and\u0000the scaling of recurrence time at the quantum critical point. We further point\u0000out $Z$ can be realized and probed in monitored quantum circuits. The\u0000analytical results are corroborated by numerical tensor renormalization group\u0000which elevates the approach outlined here to a powerful tool for interacting\u0000quantum systems.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"237 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141521240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum computational resources for lattice QCD in the strong-coupling limit 强耦合极限下格子 QCD 的量子计算资源

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-26 DOI: arxiv-2406.18721

Michael Fromm, Lucas Katschke, Owe Philipsen, Wolfgang Unger

引用次数: 0

Critical properties of metallic and deconfined quantum critical points in Dirac systems 狄拉克系统中金属和非封闭量子临界点的临界特性

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-24 DOI: arxiv-2406.17042

Zi Hong Liu, Matthias Vojta, Fakher F. Assaad, Lukas Janssen

{"title":"Critical properties of metallic and deconfined quantum critical points in Dirac systems","authors":"Zi Hong Liu, Matthias Vojta, Fakher F. Assaad, Lukas Janssen","doi":"arxiv-2406.17042","DOIUrl":"https://doi.org/arxiv-2406.17042","url":null,"abstract":"We use large-scale fermion quantum Monte Carlo simulations to study metallic\u0000and deconfined quantum phase transitions in a bilayer honeycomb model, focusing\u0000on their quantum critical and finite-temperature properties. At weak\u0000interaction, a fully symmetric Dirac semimetal state is realized. At\u0000intermediate and strong interaction, respectively, two long-range-ordered\u0000phases that break different symmetries are stabilized. The ordered phases\u0000feature partial and full, respectively, gap openings in the fermion spectrum.\u0000We clarify the symmetries of the different zero-temperature phases and the\u0000symmetry breaking patterns across the two quantum phase transitions between\u0000them. The first transition between the disordered and long-range-ordered\u0000semimetallic phases has previously been argued to be described by the\u0000$(2+1)$-dimensional Gross-Neveu-SO(3) field theory. By performing simulations\u0000with an improved symmetric Trotter decomposition, we further substantiate this\u0000claim by computing the critical exponents $1/nu$, $eta_phi$, and\u0000$eta_psi$, which turn out to be consistent with the field-theoretical\u0000expectation within numerical and analytical uncertainties. The second\u0000transition between the two long-range-ordered phases has previously been\u0000proposed as a possible instance of a metallic deconfined quantum critical\u0000point. We further develop this scenario by analyzing the spectral functions in\u0000the single-particle, particle-hole, and particle-particle channels. Our results\u0000indicate gapless excitations with a unique velocity, supporting the emergence\u0000of Lorentz symmetry at criticality. We also determine the finite-temperature\u0000phase boundaries above the fully gapped state at large interaction, which\u0000smoothly vanish near the putative metallic deconfined quantum critical point,\u0000consistent with a continuous or weakly first-order transition.","PeriodicalId":501191,"journal":{"name":"arXiv - PHYS - High Energy Physics - Lattice","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of the mass of pseudoscalar glueball with a deep neural network 利用深度神经网络研究伪星胶球的质量

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-22 DOI: arxiv-2407.12010

Lin Gao

引用次数: 0

Berezinskii--Kosterlitz--Thouless transition of the two-dimensional $XY$ model on the honeycomb lattice 别列津斯基--科斯特利茨--蜂巢晶格上二维$XY$模型的无穷过渡

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-21 DOI: arxiv-2406.14812

Fu-Jiun Jiang

引用次数: 0

Exponential Error Reduction for Glueball Calculations Using a Two-Level Algorithm in Pure Gauge Theory 在纯量子理论中使用两级算法减少胶球计算的指数误差

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-18 DOI: arxiv-2406.12656

Lorenzo Barca, Francesco Knechtli, Sofie Martins, Michael Peardon, Stefan Schaefer, Juan Andrés Urrea-Niño

引用次数: 0

Using operator covariance to disentangle scaling dimensions in lattice models 利用算子协方差来分解网格模型中的缩放维度

arXiv - PHYS - High Energy Physics - Lattice Pub Date : 2024-06-18 DOI: arxiv-2406.12681

Anders W. Sandvik

引用次数: 0