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On the absence of the Chiral Magnetic Effect in equilibrium QCD

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arxiv 2405.09484 v2 pith:SXCK7P6C submitted 2024-05-15 hep-lat hep-exhep-phhep-thnucl-th

classification hep-lathep-exhep-phhep-thnucl-th
keywords effectchiralequilibriummagneticabsencecurrentfullhomogeneous
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Lattice QCD Study of Anomalous Transport Phenomena in Strongly Interacting Matter

    hep-lat 2025-09 conditional novelty 8.0 of 10

    First physical-point lattice QCD calculation of the Chiral Separation Effect conductivity, a zero equilibrium Chiral Magnetic Effect with conserved currents, and a localized equilibrium CME in inhomogeneous fields.

  2. Out-of-equilibrium Chiral Magnetic Effect via Kubo formulas

    hep-lat 2025-02 conditional novelty 6.0 of 10

    First lattice estimate of the out-of-equilibrium CME conductivity in QCD, showing suppression below T_c and approach to perturbation theory at high T.

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