Hydrodynamics of weak integrability breaking
arXiv:2103.11997 · doi:10.1088/1742-5468/ac26b2
Abstract
We review recent progress in understanding nearly integrable models within the framework of generalized hydrodynamics (GHD). Integrable systems have infinitely many conserved quantities and stable quasiparticle excitations: when integrability is broken, only a few residual conserved quantities survive, eventually leading to thermalization, chaotic dynamics and conventional hydrodynamics. In this review, we summarize recent efforts to take into account small integrability breaking terms, and describe the transition from GHD to standard hydrodynamics. We discuss the current state of the art, with emphasis on weakly inhomogeneous potentials, generalized Boltzmann equations and collision integrals, as well as bound-state recombination effects. We also identify important open questions for future works.
Review paper, 57 pages, 7 figures. Published in JSTAT special issue 2021 "Emergent Hydrodynamics in Integrable Many-body Systems"
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