Quantum Quenches in Integrable Field Theories

Details Quantum Quenches in Integrable Field Theories Quantum Quenches in Integrable Field Theories

2009-11-17

arxiv.org/abs/0911.3345v2

New J.Phys.12:055015,2010

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1088/1367-2630/12/5/055015

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.

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