Remote Nordic HET seminar: Benjamin Doyon

Speaker: Benjamin Doyon

Title: The Space of Integrable Systems from Generalised T-Tbar-Deformations

Abstract: We introduce an extension of the generalised T-Tbar-deformation described by Smirnov-Zamolodchikov, to include the complete set of extensive charges. We show that this gives deformations of S-matrices beyond CDD factors, generating arbitrary functional dependence on momenta. We further derive from fundamental principles the flow equations for the free energy and all free energy fluxes. From this follows, without invoking the microscopic Bethe ansatz, that the thermodynamics of the deformed models are described by the integral equations of the thermodynamic Bethe-Ansatz, both in the classical and quantum realms.