Quantum Quenches in Integrable Field Theories
Statistical Mechanics
2010-12-02 v2 High Energy Physics - Theory
Abstract
We study the non equilibrium time evolution of an integrable field theory in 1+1 dimensions after a sudden variation of a global parameter of the Hamiltonian. For a class of quenches defined in the text, we compute the long times limit of the one point function of a local operator as a series of form factors. Even if some subtleties force us to handle this result with care, there is a strong evidence that for long times the expectation value of any local operator can be described by a generalized Gibbs ensemble with a different effective temperature for each eigenmode.
Cite
@article{arxiv.0911.3345,
title = {Quantum Quenches in Integrable Field Theories},
author = {Davide Fioretto and Giuseppe Mussardo},
journal= {arXiv preprint arXiv:0911.3345},
year = {2010}
}