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.
Quantum quenches in integrable field theories / Fioretto, D; Mussardo, Giuseppe. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 12:(2010), pp. 1-19. [10.1088/1367-2630/12/5/055015]
Quantum quenches in integrable field theories
Mussardo, Giuseppe
2010-01-01
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.File | Dimensione | Formato | |
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