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A Generalized Fluctuation-Dissipation Theorem for Nonlinear Response Functions

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arxiv hep-th/9809016 v1 pith:NNUIYBIG submitted 1998-09-02 hep-th hep-ph

classification hep-thhep-ph
keywords functionsnonlinearfluctuation-dissipationgeneralizedresponsetheoremamputatedclosed
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A nonlinear generalization of the Fluctuation-Dissipation Theorem (FDT) for the n-point Green functions and the amputated 1PI vertex functions at finite temperature is derived in the framework of the Closed Time Path formalism. We verify that this generalized FDT coincides with known results for n=2 and 3. New explicit relations among the 4-point nonlinear response and correlation (fluctuation) functions are presented.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Schwinger-Keldysh effective theory of charge transport: redundancies and systematic $\omega/T$ expansion

    hep-th 2025-08 unverdicted novelty 7.0 of 10

    Proves equivalence of redundant Goldstone and adjoint-matter formulations of SK EFTs for non-Abelian symmetries and extends both to all orders in ħω/T while classifying invariant kernels under DKMS and unitarity.

  2. Effective action for relativistic hydrodynamics from Crooks fluctuation theorem

    nucl-th 2025-01 conditional novelty 7.0 of 10

    A new path-integral framework for relativistic fluctuating hydrodynamics uses a covariant Crooks fluctuation theorem to impose KMS symmetry and derive fluctuation-dissipation relations, with criteria for causality and...

  3. Critical dynamics of a scalar field near four spatial dimensions

    hep-th 2026-08 accept novelty 6.0 of 10

    The exactly dissipationless critical dynamics of a scalar field is an invariant but unstable surface of the RG flow, and any small friction drives it to Model A, with new two-loop dynamic exponents.

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