SciPost Phys. 6, 023 (2019) ·
published 15 February 2019

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We, for the first time, report a firstprinciple proof of the equations of
state used in the hydrodynamic theory for integrable systems, termed
generalized hydrodynamics (GHD). The proof makes full use of the graph
theoretic approach to Thermodynamic Bethe ansatz (TBA) that was proposed
recently. This approach is purely combinatorial and relies only on common
structures shared among Bethe solvable models, suggesting universal
applicability of the method. To illustrate the idea of the proof, we focus on
relativistic integrable quantum field theories with diagonal scatterings and
without bound states such as strings.
Mr VU: "We are thankful to the referee..."
in Report on Equations of state in generalized hydrodynamics