Quantum quench in the sine-Gordon model

Abstract

We consider the time evolution in the repulsive sine-Gordon quantum field theory after the system is prepared in a particular class of initial states. We focus on the time dependence of the one-point function of the semi-local operator $\exp (i\beta \Phi (x)/2)$. By using two different methods based on form-factor expansions, we show that this expectation value decays to zero exponentially, and we determine the decay rate by analytical means. Our methods generalise to other correlation functions and integrable models.

41 pages, 1 figure, some typos corrected

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• Stationary states in a free fermionic chain from the Quench Action Method
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• Exact finite volume expectation values of local operators in excited states
• Towards a Non-equilibrium Bethe ansatz for the Kondo Model