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Searching for Axions and the String Axiverse in the Cosmo

23/10/2018 dalle 15:00 alle 16:00

Dove Aula Teorici, piano 2, via Irnerio 46, Bologna

Contatto di riferimento ; Gian Paolo Vacca

Partecipanti Dr. Luca Visinelli: Stockholm University

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Abstract: The low-energy limit of several string theories feature what is known as the “axiverse”, a plethora of light axions with masses spanning various orders of magnitude. I will first discuss astrophysical and cosmological constraints on axions at either end of this spectrum, using data from the cosmic microwave background anisotropies and from the gravitational microlensing. I then show how to assess the string parameters using a series of Bayesian analyses that take into account current limits on the tensor-to-scalar ratio and the primordial isocurvature fraction. Based on hep-ph/1809.06382.