Reconciling thermal leptogenesis and gravitino by the strong CP problem and its observation

Friday September 16th, 14:30hs - Seminar room


Speaker:  Jasper Hasenkamp (University of Hamburg)


A consistent cosmology has to explain the observed matter composition of the Universe and should enable solutions to all problems of the Standard Model.

To this end, we investigate possible solutions to the gravitino problem of thermal leptogenesis as origin of matter and at the same time implement the Peccei-Quinn mechanism as solution to the strong CP problem. In this overall picture a consistent cosmology appears--maybe counter-intuitively-- easier to achieve than particular solutions to each subproblem. Problems often even turn out as fortunes. More importantly, such scenarios are, in addition, observable in the cosmic microwave background and the gravitational wave background from inflation.

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