Many properties of the cosmos that we observe today are the result of nonequilibrium quantum processes in the early universe. While semi-classical Boltzmann equations in many cases offer a reasonably good description, there are situations in which their ad-hoc use introduces uncontrollable uncertainties. The Closed Time Path Formalism offers a systematic way to derive quantum kinetic equations from first principles in a series of controlled approximations. We discuss two applications related to the origin of matter in the universe, namely cosmic reheating and leptogenesis.

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Marco Drewes got his PHD from Hamburg University in 2009. After his postdoc in Technical University of Munich, he became a junior in the Center of Cosmology, Particle Physics and Phenomenology at Catholic University of Louvain. His Research directions include cosmology and general relativity, phenomenology of elementary particles, and theories of the fundamental interactions. 

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于江浩 研究员