SÉMINAIRE DU GRECO
"Decoherence and thermalization of a pure quantum state in quantum field theory" |
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J. Serreau |
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We study the real-time evolution of a self-interacting O(N) scalar field initially prepared in a pure, coherent quantum state. We present a complete solution of the nonequilibrium quantum dynamics from a 1/N-expansion of the two-particle-irreducible effective action at next-to-leading order, which includes scattering and memory effects. We demonstrate that, restricting one''s attention (or ability to measure) to a subset of the infinite hierarchy of correlation functions, one observes an effective loss of putity/coherence and, on longer time scales, thermalization. We point out that the physics of decoherence is well described by classical statistical field theory. |
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lundi 15 février 2010 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
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