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Positive magnetoresistance induced by hydrodynamic fluctuations in chiral media
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We analyze the combined effects of hydrodynamic fluctuations and chiral magnetic effect (CME) for a chiral medium in the presence of a background magnetic field. Based on the recently developed non-equilibrium effective field theory, we show fluctuations give rise to a CME-related positive contribution to magnetoresistance, while the early studies without accounting for the fluctuations find a CME-related negative magnetoresistance. At zero axial relaxation rate, the fluctuations contribute to the transverse conductivity in addition to the longitudinal one.
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Schwinger-Keldysh effective action for hydrodynamics with approximate symmetries
The axial charge relaxation coefficient in the Schwinger-Keldysh effective theory of QCD must be of second order in the quark mass, Γ_A = γ_A m_q^2, subleading in the broken phase and leading in the restored phase.
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