Response Theory for Equilibrium and Non-Equilibrium Statistical Mechanics: Causality and Generalized Kramers-Kronig Relations

@article{Lucarini2008ResponseTF,
  title={Response Theory for Equilibrium and Non-Equilibrium Statistical Mechanics: Causality and Generalized Kramers-Kronig Relations},
  author={Valerio Lucarini},
  journal={Journal of Statistical Physics},
  year={2008},
  volume={131},
  pages={543-558}
}
  • V. Lucarini
  • Published 4 October 2007
  • Physics
  • Journal of Statistical Physics
We consider the general response theory recently proposed by Ruelle for describing the impact of small perturbations to the non-equilibrium steady states resulting from Axiom A dynamical systems. We show that the causality of the response functions entails the possibility of writing a set of Kramers-Kronig (K-K) relations for the corresponding susceptibilities at all orders of nonlinearity. Nonetheless, only a special class of directly observable susceptibilities obey K-K relations. Specific… 
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