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SS22 – Abstract
Felix Kahlhoefer
(TTK, RWTH Aachen)
9.6.2022
Phenomenology and cosmology of decaying axion-like particles
Many extensions of the Standard Model feature spontaneously broken new symmetries that give rise to bosonic particles with naturally small masses and couplings, so-called axion-like particles (ALPs). In my talk I will present the phenomenology of MeV-scale ALPs, which are predicted to be long-lived on the time scales relevant for particle physics and cosmology. I will discuss various experimental and observational strategies to constrain such ALPs, ranging from collider and fixed-target experiments to supernovae and cosmology. A particular focus will be on lifetimes in the range of (thousands of) years, for which decaying ALPs can have an observable effect on the Cosmic Microwave Background and primordial element abundances.
