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Theory Seminar (High Energy/Cosmology)

<< Fall 2021 Spring 2022 Summer 2022 >>
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Gravitational Wave Probes of Axion Rotations Responsible for Dark Matter and Baryon Asymmetry
Date: Friday, March 11th
Time: 1:00 pm
Place: Chamberlin 5280
Speaker: Raymond Co, University of Minnesota
Abstract: We established a paradigm where the (QCD) axion’s novel cosmological evolution, a rotation in the field space, gives rise to dark matter and the baryon asymmetry. The axion rotations also provide a natural origin for a kination era, where the total energy density is dominated by the kinetic term of the axion field, preceded by an early era of matter domination. We investigate the effects of this cosmological scenario on the spectrum of possible primordial gravitational waves from inflation or cosmic strings and find that the spectrum features a triangular peak. As a result, future gravitational wave observations can probe the viable parameter space of kination, including regions that produce axion dark matter by the kinetic misalignment mechanism or the baryon asymmetry by axiogenesis. Lastly, the axion rotation may also source the cosmic perturbations with an observable amount of non-Gaussianity.
Host: George Wojcik
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