Renormalised nonequilibrium quantum field theory: scalar fields

Details Renormalised nonequilibrium quantum field theory: scalar fields Renormalised nonequilibrium quantum field theory: scalar fields

2008-09-02

arxiv.org/abs/0809.0496v1

Phys.Rev.D80:125029,2009

Physics

High Energy Physics

High Energy Physics - Theory

18 pages in revtex4, 5 figures

Scientific paper

10.1103/PhysRevD.80.125029

We discuss the renormalisation of the initial value problem in quantum field theory using the two-particle irreducible (2PI) effective action formalism. The nonequilibrium dynamics is renormalised by counterterms determined in equilibrium. We emphasize the importance of the appropriate choice of initial conditions and go beyond the Gaussian initial density operator by defining self-consistent initial conditions. We study the corresponding time evolution and present a numerical example which supports the existence of a continuum limit for this type of initial conditions.

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