The fermionic path integral in an assumed infrared fluid phase yields the three previously conjectured anomalous hydrodynamic actions, with the anomaly terms identified as transgression forms and a two-parameter gauge-invariant freedom left undetermined.
A panoply of Schwinger-Keldysh transport
2 Pith papers cite this work. Polarity classification is still indexing.
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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.
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hep-th 2years
2026 2representative citing papers
Lectures summarizing the construction of hydrodynamic EFTs through strong-to-weak symmetry breaking, with examples from spin chains to relativistic QFTs and UV/IR constraints on transport coefficients.
citing papers explorer
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Hydrodynamics of perfect fluids with anomalies from the fermionic path integral
The fermionic path integral in an assumed infrared fluid phase yields the three previously conjectured anomalous hydrodynamic actions, with the anomaly terms identified as transgression forms and a two-parameter gauge-invariant freedom left undetermined.
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Boulder Lectures on Thermal Dynamics and Hydrodynamic EFTs
Lectures summarizing the construction of hydrodynamic EFTs through strong-to-weak symmetry breaking, with examples from spin chains to relativistic QFTs and UV/IR constraints on transport coefficients.