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Diluting the inflationary axion fluctuation by a stronger QCD in the early Universe

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Title
Diluting the inflationary axion fluctuation by a stronger QCD in the early Universe
Author(s)
Kiwoon Choi; Eung Jin Chun; Sang Hui Im; Kwang Sik Jeong
Publication Date
2015-11
Journal
PHYSICS LETTERS B, v.750, no., pp.26 - 30
Publisher
ELSEVIER SCIENCE BV
Abstract
We propose a new mechanism to suppress the axion isocurvature perturbation, while producing the right amount of axion dark matter, within the framework of supersymmetric axion models with the axion scale induced by supersymmetry breaking. The mechanism involves an intermediate phase transition to generate the Higgs μ-parameter, before which the weak scale is comparable to the axion scale and the resulting stronger QCD yields an axion mass heavier than the Hubble scale over a certain period. Combined with that the Hubble-induced axion scale during the primordial inflation is well above the intermediate axion scale at present, the stronger QCD in the early Universe suppresses the axion fluctuation to be small enough even when the inflationary Hubble scale saturates the current upper bound, while generating an axion misalignment angle of order unity.
URI
http://pr.ibs.re.kr/handle/8788114/1846
DOI
10.1016/j.physletb.2015.08.041
ISSN
0370-2693
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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