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Topological defects and nano-Hz gravitational waves in aligned axion models

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Title
Topological defects and nano-Hz gravitational waves in aligned axion models
Author(s)
Tetsutaro Higaki; Kwang Sik Jeong; Naoya Kitajima; Toyokazu Sekiguchi; Fuminobu Takahash
Publication Date
2016-08
Journal
JOURNAL OF HIGH ENERGY PHYSICS, v.2016, no.8, pp.044
Publisher
SPRINGER
Abstract
We study the formation and evolution of topological defects in an aligned axion model with multiple Peccei-Quinn scalars, where the QCD axion is realized by a certain combination of the axions with decay constants much smaller than the conventional Peccei-Quinn breaking scale. When the underlying U(1) symmetries are spontaneously broken,the aligned structure in the axion field space exhibits itself as a complicated string-wall network in the real space. We find that the string-wall network likely survives until the QCD phase transition if the number of the Peccei-Quinn scalars is greater than two. The string-wall system collapses during the QCD phase transition, producing a significant amount of gravitational waves in the nano-Hz range at present. The typical decay constant is constrained to be belowO(100) TeV by the pulsar timing observations, and the constraint will be improved by a factor of 2 in the future SKA observations. (c) The Authors.
URI
https://pr.ibs.re.kr/handle/8788114/3284
DOI
10.1007/JHEP08(2016)044
ISSN
1029-8479
Appears in Collections:
HiddenCommunity > 1. Journal Papers (저널논문)
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