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A panoply of Schwinger-Keldysh transport

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

Submission summary

As Contributors: Kristan Jensen
Arxiv Link: https://arxiv.org/abs/1804.04654v3
Date accepted: 2018-11-22
Date submitted: 2018-11-08
Submitted by: Jensen, Kristan
Submitted to: SciPost Physics
Discipline: Physics
Subject area: High-Energy Physics - Theory
Approach: Theoretical

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.

Ontology / Topics

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Hydrodynamics Relativistic fluids Schwinger-Keldysh method

Published as SciPost Phys. 5, 053 (2018)



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.

Submission & Refereeing History

Resubmission 1804.04654v3 on 8 November 2018
Submission 1804.04654v2 on 6 July 2018

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