Diffusion in generalized hydrodynamics and quasiparticle scattering

@article{Nardis2019DiffusionIG,
  title={Diffusion in generalized hydrodynamics and quasiparticle scattering},
  author={Jacopo de Nardis and Denis Bernard and Benjamin Doyon},
  journal={SciPost Physics},
  year={2019}
}
We extend beyond the Euler scales the hydrodynamic theory for quantum and classical integrable models developed in recent years, accounting for diffusive dynamics and local entropy production. We review how the diffusive scale can be reached via a gradient expansion of the expectation values of the conserved fields and how the coefficients of the expansion can be computed via integrated steady-state two-point correlation functions, emphasising that {\mathcal PT}𝒫T-symmetry can fully fix the… 

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