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General thermodynamic equilibrium with axial chemical potential for the free Dirac field

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arxiv 1807.02071 v4 pith:YWGMF5YH submitted 2018-07-05 hep-th gr-qcnucl-th

General thermodynamic equilibrium with axial chemical potential for the free Dirac field

classification hep-th gr-qcnucl-th
keywords axialchemicalpotentialcomponentscurrentsdensitydiracequilibrium
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We calculate the constitutive equations of the stress-energy tensor and the currents of the free massless Dirac field at thermodynamic equilibrium with acceleration and rotation and a conserved axial charge by using the density operator approach. We carry out an expansion in thermal vorticity to the second order with finite axial chemical potential $\mu_A$. The obtained coefficients of the expansion are expressed as correlators of angular momenta and boost operators with the currents. We confirm previous observations that the axial chemical potential induces non-vanishing components of the stress-energy tensor at first order in thermal vorticity due to breaking of parity invariance of the density operator with $\mu_A \ne 0$. The appearance of these components might play an important role in chiral hydrodynamics.

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