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A panoply of Schwinger-Keldysh transport

by Kristan Jensen, Raja Marjieh, Natalia Pinzani-Fokeeva, Amos Yarom

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Submission summary

Authors (as registered SciPost users): Kristan Jensen · Amos Yarom
Submission information
Preprint Link:  (pdf)
Date accepted: 2018-11-22
Date submitted: 2018-11-08 01:00
Submitted by: Jensen, Kristan
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • Condensed Matter Physics - Theory
  • High-Energy Physics - Theory
Approach: Theoretical


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.

Author comments upon resubmission

We would like to thank both of the Referees for their comments and careful reading of our manuscript. We have fixed the various typos pointed out by Referee 2, as well as implemented the other two suggestions made.

List of changes

- We fixed the typos noted by Referee 2.
- We added a brief comment to the end of the Introduction referring the curious reader immediately to our summary and table in Section 8.1.
- We fixed the (incorrect as written) second sentence in Section 6.2.4.

Published as SciPost Phys. 5, 053 (2018)

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