Particle number in kinetic theory

Details Particle number in kinetic theory Particle number in kinetic theory

2002-11-22

arxiv.org/abs/hep-th/0211219v2

Eur.Phys.J. C38 (2004) 135-143

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, 2 figures, macros: revtex, epsfig. Published version

Scientific paper

10.1140/epjc/s2004-02007-0

We provide a derivation for the particle number densities on phase space for scalar and fermionic fields in terms of Wigner functions. Our expressions satisfy the desired properties: for bosons the particle number is positive, for fermions it lies in the interval between zero and one, and both are consistent with thermal field theory. As applications we consider the Bunch-Davies vacuum and fermionic preheating after inflation.

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