München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 23: Theoretische Astroteilchenphysik und Kosmologie 2

T 23.4: Talk

Tuesday, March 10, 2009, 17:30–17:45, M114

Kadanoff-Baym and Boltzmann Equations for a Toy Model of Leptogenesis — •Andreas Hohenegger, Alexander Kartavtsev, and Manfred Lindner — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

We investigate the influence of quantum effects on leptogenesis. These aspects are usually neglected in treatments of this mechanism for the generation of the baryon asymmetry of the universe. To this end we consider a toy model consisting of two real and one complex scalar fields and derive the corresponding system of Kadanoff--Baym and Boltzmann equations valid in the expanding Universe. In the expanding universe the CP--violating parameter becomes a function of time; the time--dependence is analyzed analytically and numerically. We also present numerical solutions of the system of Boltzmann equations and compare them to solutions of the corresponding system of integrated Boltzmann equations.