Quantum Boltzmann Equations and Leptogenesis

Details Quantum Boltzmann Equations and Leptogenesis Quantum Boltzmann Equations and Leptogenesis

2007-03-16

arxiv.org/abs/hep-ph/0703175v2

JCAP0708:002,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 5 figures. IOP LaTeX class used. Minor corrections and references added. Matches the version published in JCAP

Scientific paper

10.1088/1475-7516/2007/08/002

The closed time-path formalism is a powerful Green's function formulation to describe non-equilibrium phenomena in field theory and it leads to a complete non-equilibrium quantum kinetic theory. We make use of this formalism to write down the set of quantum Boltzmann equations relevant for leptogenesis. They manifest memory effects and off-shell corrections. In particular, memory effects lead to a time-dependent CP asymmetry whose value at a given instant of time depends upon the previous history of the system. This result is particularly relevant when the asymmetry is generated by the decays of nearly mass-degenerate heavy states, as in resonant or soft leptogenesis.

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