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A panoply of Schwinger-Keldysh transport
by Kristan Jensen, Raja Marjieh, Natalia Pinzani-Fokeeva, Amos Yarom
- Published as SciPost Phys. 5, 053 (2018)
|As Contributors:||Kristan Jensen|
|Submitted by:||Jensen, Kristan|
|Submitted to:||SciPost Physics|
|Subject area:||High-Energy Physics - Theory|
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.
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Published as SciPost Phys. 5, 053 (2018)
Author comments upon resubmission
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.