A panoply of Schwinger-Keldysh transport

Apr 12, 2018
96 pages
Published in:
  • SciPost Phys. 5 (2018) 5, 053
  • Published: Nov 27, 2018
e-Print:
DOI:

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Abstract: (SciPost Fundation)
We classify all possible allowed constitutive relations of relativisticfluids in a statistical mechanical limit using the Schwinger-Keldysh effectiveaction for hydrodynamics. We find that microscopic unitarity enforces genuinelynew constraints on the allowed transport coefficients that are invisible in theclassical hydrodynamic description; they are not implied by the second law orthe Onsager relations. We term these conditions Schwinger-Keldysh positivityand provide explicit examples of the various allowed terms.
Note:
  • 96 pages; v2. Corrected an error regarding CPT transformation properties of dissipative transport and added references; v3. Minor fixes
  • fluid: relativistic
  • hydrodynamics
  • effective action
  • statistical
  • unitarity
  • transport theory
  • thermodynamics
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