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arXiv 2405.09484hep-lathep-exhep-phhep-thnucl-th
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论平衡态QCD中手征磁效应的缺失

On the absence of the Chiral Magnetic Effect in equilibrium QCD

Bastian B. Brandt, Gergely Endrődi, Eduardo Garnacho-Velasco, Gergely Markó

AI总结:

本文通过格点QCD模拟证明手征磁效应的主导系数在平衡态下消失,强调需使用规范不变紫外正则化,并澄清该结论仅适用于平衡态情形。

摘要:

本文研究手征磁效应(CME):在QCD中由均匀背景磁场和均匀手征失衡引起的电流产生。我们证明,描述CME的主导系数在平衡态下消失,无论对于自由费米子还是全QCD均成立。我们的全QCD结果基于连续外推的格点模拟,使用具有物理质量动力学交错夸克以及淬火Wilson夸克。我们表明,使用规范不变的紫外正则化来计算CME至关重要,并详细阐述为何现有的一些平衡态计算给出了非零结果。我们强调,我们的发现意味着平衡态QCD中不存在时间无关的CME电流流动,但不涉及作为非平衡态、时间依赖效应的CME。

英文摘要:

In this paper we investigate the chiral magnetic effect (CME): the generation of an electric current due to a homogeneous background magnetic field and a homogeneous chiral imbalance in QCD. We demonstrate that the leading coefficient describing the CME vanishes in equilibrium, both for free fermions as well as in full QCD. Our full QCD results are based on continuum extrapolated lattice simulations using dynamical staggered quarks with physical masses as well as quenched Wilson quarks. We show that it is crucial that a gauge invariant ultraviolet regularization is used to compute the CME and elaborate on why some of the existing in-equilibrium calculations of this effect gave a nonzero result. We stress that our findings imply the absence of a time-independent CME current flowing in equilibrium QCD, but do not concern the CME as an out-of-equilibrium, time-dependent effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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