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Author Giraud, Alexandre ♦ Serreau, Julien
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2009-10-14
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics
Subject Keyword High Energy Physics - Phenomenology ♦ Condensed Matter - Other Condensed Matter ♦ High Energy Physics - Theory ♦ Nuclear Theory ♦ physics:cond-mat ♦ physics:hep-ph ♦ physics:hep-th ♦ physics:nucl-th
Abstract We study the real-time evolution of a self-interacting O(N) scalar field initially prepared in a pure 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. Restricting one's attention (or ability to measure) to a subset of the infinite hierarchy of correlation functions, the system is described by an effective (reduced) density matrix which, unlike the full density matrix, has a nontrivial time evolution. In particular, starting from a pure quantum state, we observe the loss of putity/coherence and, on longer time scales, thermalization of the reduced density matrix. We point out that the physics of decoherence is well described by classical statistical field theory.
Description Reference: Phys.Rev.Lett.104:230405,2010
Educational Use Research
Learning Resource Type Article
Page Count 4


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