Quantum quenches in integrable field theories. (English) Zbl 1375.81169
Summary: We study the non-equilibrium time evolution of an integrable field theory in 1+1 dimensions after sudden variation of a global parameter of the Hamiltonian. For a class of quenches defined in the text, we compute the long time 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 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.
MSC:
| 81T10 | Model quantum field theories |
| 81R12 | Groups and algebras in quantum theory and relations with integrable systems |
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