Boundary state in an integrable quantum field theory out of equilibrium

Spyros Sotiriadis, G. Takács, Giuseppe Mussardo

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We study a quantum quench of the mass and the interaction in the Sinh-Gordon model starting from a large initial mass and zero initial coupling. Our focus is on the determination of the expansion of the initial state in terms of post-quench excitations. We argue that the large energy profile of the involved excitations can be relevant for the late time behaviour of the system and common regularization schemes are unreliable. We therefore proceed in determining the initial state by first principles expanding it in a systematic and controllable fashion on the basis of the asymptotic states. Our results show that, for the special limit of pre-quench parameters we consider, it assumes a squeezed state form that has been shown to evolve so as to exhibit the equilibrium behaviour predicted by the Generalized Gibbs Ensemble.

Original languageEnglish
Pages (from-to)52-57
Number of pages6
JournalPhysics Letters B
Volume734
DOIs
Publication statusPublished - Jun 27 2014

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excitation
expansion
profiles
interactions
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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Boundary state in an integrable quantum field theory out of equilibrium. / Sotiriadis, Spyros; Takács, G.; Mussardo, Giuseppe.

In: Physics Letters B, Vol. 734, 27.06.2014, p. 52-57.

Research output: Contribution to journalArticle

Sotiriadis, Spyros ; Takács, G. ; Mussardo, Giuseppe. / Boundary state in an integrable quantum field theory out of equilibrium. In: Physics Letters B. 2014 ; Vol. 734. pp. 52-57.
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