We investigate the production of axion quanta during the early universe evolution of an axion-like field rolling down a wiggly potential. We compute the growth of quantum fluctuations and their back-reaction on the homogeneous zero-mode. We evaluate the transfer of kinetic energy from the zero mode to the quantum fluctuations and the conditions to decelerate the axion zero-mode as a function of the Hubble rate, the slope of the potential, the size of the barriers and the initial field velocity. We discuss how these effects impact the relaxion mechanism.
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Fonseca, N., Morgante, E., Sato, R. et al. Axion fragmentation. J. High Energ. Phys. 2020, 10 (2020). https://doi.org/10.1007/JHEP04(2020)010
- Beyond Standard Model
- Cosmology of Theories beyond the SM