A panoply of Schwinger-Keldysh transport
arXiv:1804.04654 · doi:10.21468/SciPostPhys.5.5.053
Abstract
We classify all possible allowed constitutive relations of relativistic fluids in a statistical mechanical limit using the Schwinger-Keldysh effective action for hydrodynamics. We find that microscopic unitarity enforces genuinely new constraints on the allowed transport coefficients that are invisible in the classical hydrodynamic description; they are not implied by the second law or the Onsager relations. We term these conditions Schwinger-Keldysh positivity and provide explicit examples of the various allowed terms.
96 pages; v2. Corrected an error regarding CPT transformation properties of dissipative transport and added references; v3. Minor fixes
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