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      Classical aspects of quantum fields far from equilibrium

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          Abstract

          We consider the time evolution of nonequilibrium quantum scalar fields in the O(N) model, using the next-to-leading order 1/N expansion of the 2PI effective action. A comparison with exact numerical simulations in 1+1 dimensions in the classical limit shows that the 1/N expansion gives quantitatively precise results already for moderate values of N. For sufficiently high initial occupation numbers the time evolution of quantum fields is shown to be accurately described by classical physics. Eventually the correspondence breaks down due to the difference between classical and quantum thermal equilibrium.

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          Brownian Motion of a Quantum Oscillator

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            Ground-State Energy of a Many-Fermion System. II

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              Effective action for composite operators

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                Author and article information

                Journal
                2001-07-11
                2001-12-07
                Article
                10.1103/PhysRevLett.88.041603
                hep-ph/0107129
                7d41a3e4-d8ef-499d-9681-a157ce68df00
                History
                Custom metadata
                HD-THEP-01-28
                Phys.Rev.Lett.88:041603,2002
                4 pages with 4 eps figures, minor changes; to appear in PRL
                hep-ph hep-th

                High energy & Particle physics
                High energy & Particle physics

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