Schedule Aug 22, 2012
Quantum Quench in a Conformal Field Theory From a General Short-Range State
John Cardy (Univ. Oxford)

We consider the time evolution of a system described by a 1+1-dimensional conformal field theory (CFT) from states with short-range correlations and entanglement which are more general than that considered in Calabrese-Cardy [2006]. We show that, while the correlation functions in any finite region still become stationary at late times, they do not have a thermal form. Instead, the effective temperature as measured by correlations depends on the observable. We argue that this is consistent with the stationary distribution being given by a generalised Gibbs ensemble, which may, however, depend on non-local parafermionic charges.

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