Classical aspects of quantum fields far from equilibrium

Details Classical aspects of quantum fields far from equilibrium Classical aspects of quantum fields far from equilibrium

2001-07-11

arxiv.org/abs/hep-ph/0107129v2

Phys.Rev.Lett.88:041603,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages with 4 eps figures, minor changes; to appear in PRL

Scientific paper

10.1103/PhysRevLett.88.041603

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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