Axion fragmentation

Fonseca de Sa, Nayara; Servant, Géraldine; Morgante, Enrico; Sato, Ryosuke

doi:10.1007/JHEP04(2020)010

Journal Article

PUBDB-2020-01572

Axion fragmentation

Fonseca de Sa, N. (Corresponding author)DESY* ; Morgante, E. (Corresponding author)DESY* ; Sato, R. (Corresponding author)DESY* ; Servant, G. (Corresponding author)DESY*

2020
SISSA [Trieste]

Journal of high energy physics 04(4), 010 (2020) [10.1007/JHEP04(2020)010]

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Please use a persistent id in citations: doi:10.1007/JHEP04(2020)010 doi:10.3204/PUBDB-2020-01572

Report No.: DESY-19-202; arXiv:1911.08472

Abstract: 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.

Keyword(s): fluctuation: quantum ; axion: production ; potential: slope ; energy: kinetic ; zero mode ; Hubble constant ; fragmentation ; back reaction ; axion-like particles

Classification:

ddc:530

Note: 29 pages and 17 figures in main text, 24 pages and 7 figures in appendices, v2: published version

Contributing Institute(s):

Theorie-Gruppe (T)

Research Program(s):

Experiment(s):

No specific instrument

Appears in the scientific report 2020

Database coverage:
Creative Commons Attribution CC BY 4.0

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