SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 50: Invited Topical Talks I-A

T 50.4: Invited Topical Talk

Wednesday, March 22, 2023, 12:00–12:20, HSZ/AUDI

Axion fragmentation — •Enrico Morgante — Johannes Gutemberg Universität, Mainz, Deutschland

Axion-like particles are a key ingredient of many new physics scenarios, well motivated both from the theoretical and phenomenological point of view. In a number of recent proposals, the non-trivial dynamical evolution of an axion field in the early universe is used to solve many open problems of particle physics and cosmology, such as the hierarchy problem, Dark Matter, and others. An effect which was previously overlooked is the growth of quantum fluctuations when the axion rolls down a potential with multiple minima. This effect is particularly relevant for the relaxion mechanism and for the kinetic misalignment scenario. I will introduce this effect presenting analytic and lattice results, and then discuss the cosmological aspects of the scenario.