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Out-of-equilibrium Dynamics of Integrable Models in the Presence of Unstable Quasiparticles

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HY2W04 - Statistical mechanics, integrability and dispersive hydrodynamics

Since 2016 generalised hydrodynamics has become one of the leading approaches used to study the dynamics of out-of-equilibrium many-body quantum systems, especially integrable ones. In our recent work we have investigated the role of unstable quasiparticles in this context and whether or not they have an effect in the long-term dynamics of integrable systems. The answer is that they do, and that this is apparent just by studying both simple functions such as the densities and effective velocities of stable quasiparticles as functions of space and time, as well as less trivial quantities such as the long-time stationary state entropy.  In this talk I will review our main results, which have been presented in several papers and preprints. 

This talk is part of the Isaac Newton Institute Seminar Series series.

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