极端磁场对交叉区附近QCD拓扑磁化率的影响

IF 5.4 1区物理与天体物理 Q1 Physics and Astronomy

Journal of High Energy Physics Pub Date : 2024-12-30 DOI:10.1007/JHEP12(2024)228

B. B. Brandt, G. Endrődi, J. J. Hernández Hernández, G. Markó

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引用次数: 0

摘要

我们提出了在强背景磁场存在下晶格QCD的拓扑磁化率的首次测定。我们的模拟使用了2+1种具有物理质量的粗壮改进的交错夸克，并覆盖了广泛的温度和磁场值。使用四种不同的晶格间距和特征值重加权技术来减少离散误差，将结果外推到连续统极限。在低温条件下，我们的计算表明，由于磁场的作用，拓扑磁化率会增强，这与手性微扰理论的预测相一致。在高温下，我们观察了逆磁催化对磁化率的影响。

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Impact of extreme magnetic fields on the QCD topological susceptibility in the vicinity of the crossover region

We present the first determination of the topological susceptibility from lattice QCD in the presence of strong background magnetic fields. Our simulations employ 2+1 flavours of stout-improved staggered quarks with physical masses and cover a broad range of temperatures and magnetic field values. The results are extrapolated to the continuum limit using four different lattice spacings and an eigenvalue reweighting technique to reduce discretisation errors. For low temperatures, our calculations show an enhancement of the topological susceptibility due to the magnetic field, compatible with predictions from chiral perturbation theory. At high temperatures, we observe the impact of inverse magnetic catalysis on the susceptibility.

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来源期刊

Journal of High Energy Physics 物理-物理：粒子与场物理

CiteScore

10.30

自引率

46.30%

发文量

2107

审稿时长

1.5 months

期刊介绍： The aim of the Journal of High Energy Physics (JHEP) is to ensure fast and efficient online publication tools to the scientific community, while keeping that community in charge of every aspect of the peer-review and publication process in order to ensure the highest quality standards in the journal. Consequently, the Advisory and Editorial Boards, composed of distinguished, active scientists in the field, jointly establish with the Scientific Director the journal''s scientific policy and ensure the scientific quality of accepted articles. JHEP presently encompasses the following areas of theoretical and experimental physics: Collider Physics Underground and Large Array Physics Quantum Field Theory Gauge Field Theories Symmetries String and Brane Theory General Relativity and Gravitation Supersymmetry Mathematical Methods of Physics Mostly Solvable Models Astroparticles Statistical Field Theories Mostly Weak Interactions Mostly Strong Interactions Quantum Field Theory (phenomenology) Strings and Branes Phenomenological Aspects of Supersymmetry Mostly Strong Interactions (phenomenology).