Quantum corrections to Boltzmann equations

Details Quantum corrections to Boltzmann equations Quantum corrections to Boltzmann equations

2003-01-20

arxiv.org/abs/hep-ph/0301158v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, Latex, 1 eps figure. To appear in the proceedings of Strong and Electroweak Matter (SEWM 2002), Heidelberg, Germany,

Scientific paper

Because of IR (pinch) singularities a resummation is necessary in non-equilibrium field theories, that can be performed by using Kadanoff--Baym equations. Taking Landau prescription correctly into account, Kadanoff--Baym equations reduce to Boltzmann equations only in a restricted kinematical range; in other cases a new equation (the former constraint equation) has to be considered. In relaxation time approximation this new equation results in the shifting and smearing of multiparticle thresholds.

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