String axions: the hot and the fuzzy

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• Nicole Righi (King's College London)
• Monday 28 April 2025, 13:00-14:00
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room].

If you have a question about this talk, please contact Thomas Colas.

String axions have been proposed as candidates for solving several puzzles in cosmology. In this talk, I will focus on axions as dark matter. After reviewing how string axions can occur in our universe, I will provide a string theoretical explanation of dark matter as composed of axions coming from type IIB string theory. Based on the latest bounds, I will show how likely it is for dark matter to be composed of such particles and in which abundance, and I will provide predictions on the preferred ranges of masses and decay constants. On the contrary, requiring the axions to lie in a particular range of the parameter space imposes constraints on the UV theory. I will focus both on the role of moduli stabilization and the landscape of string vacua. Finally, I will discuss axion production at the end of inflation and the implications for the proposed cosmic axion background.

This talk is part of the Cosmology Lunch series.

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