A panoply of Schwinger-Keldysh transport

Journal Article · 26 November 2018 · SciPost Physics

DOI: https://doi.org/10.21468/SciPostPhys.5.5.053 · OSTI ID:1483433

Jensen, Kristan  ^[1]; Marjieh, Raja ^[2]; Pinzani-Fokeeva, Natalia ^[3]; Yarom, Amos ^[2]

---

1. San Francisco State University
2. Technion – Israel Institute of Technology
3. KU Leuven

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.

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0013682
• OSTI ID: 1483433
• Journal Information: SciPost Physics, Journal Name: SciPost Physics Journal Issue: 5 Vol. 5
• Publisher: Stichting SciPostCopyright Statement
• Country of Publication: Country unknown/Code not available
• Language: English