ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Marco Drewes (Lausanne)
Title: Towards a Quantum Theory of Leptogenesis
Date: Thu, Nov 19, 2009, 13:30 - 15:00
Place: Seminar Room at IPMU Prefab. B
Abstract: The generation of a matter-antimatter asymmetry in the universe, baryogenesis, happens via out-of-equilibrium processes in the primordial plasma. These are usually studied in terms of semiclassical approximations, in particular Boltzmann equations (BE). One of the most promising mechanisms for baryogenesis is provided by leptogenesis, where the asymmetry arises as a consequence of a quantum interference. It has recently been pointed out that in this context there are situations in which a fully quantum mechanical treatment is necessary. A consistent description of the non-equilibrium dynamics of quantum systems is given by the Kadanoff-Baym equations (KBE). We solve the KBE relevant for leptogenesis and compare the solutions to those obtained from BE.
Remarks: contact: F.Takahashi