Production and Evolution of Dark Matter Axions in the Early Universe

Saikawa, Ken'ichi; Noumi, Toshifumi; Hiramatsu, Takashi; Sekiguchi, Toyokazu; Kawasaki, Masahiro; Sato, Ryosuke; Yamaguchi, Masahide

Contribution to a conference proceedings/Contribution to a book

PUBDB-2016-05926

Production and Evolution of Dark Matter Axions in the Early Universe

Saikawa, K. ; Hiramatsu, T. ; Kawasaki, M. ; Noumi, T. ; Sato, R. ; Sekiguchi, T. ; Yamaguchi, M.

2014
Verlag Deutsches Elektronen-Synchrotron Hamburg
ISBN: 978-3-935702-59-1

Saikawa, Ken'ichi "Production and Evolution of Dark Matter Axions in the Early Universe" in Proceedings, 10th Patras Workshop on Axions, WIMPs and WISPs (AXION-WIMP 2014) / Tsesmelis, Emmanuel, Maroudas, Marios (eds.), Verlag Deutsches Elektronen-Synchrotron : 2014 ; AXION-WIMP 2014 : 10th Patras Workshop on Axions, WIMPs and WISPs, 2014-06-29 - 2014-07-04, Geneva
10th Patras Workshop on Axions, WIMPs and WISPs, AXION-WIMP 2014, Geneva, Switzerland, 29 Jun 2014 - 4 Jul 2014 Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-PROC 131-134 (2014) [10.3204/DESY-PROC-2014-03/saikawa_kenichi]

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Please use a persistent id in citations: doi:10.3204/DESY-PROC-2014-03/saikawa_kenichi

Abstract: Production mechanisms and interaction properties of dark matter axions are investigated. The decay of string-wall systems gives an additional contribution to the dark matter abundance, which implies that the axion becomes dark matter in the high mass range of $\mathcal{O}(10^{-4} - 10^{-2})\mathrm{eV}$. The structure of gravitational self-interactions of coherently oscillating axions is also evaluated, and it turns out that their self-interaction rate can be relevant in their late time evolution.

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