Dark Energy, QCD Axion, and Trans-Planckian-Inflaton Decay Constant

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Title
Dark Energy, QCD Axion, and Trans-Planckian-Inflaton Decay Constant
Author(s)
Jihn E. Kim
Publication Date
2017-09
Journal
Universe, v.3, no.4, pp.68 -
Abstract
Pseudoscalars appear frequently in particle spectra. They can be light if they appear as pseudo-Goldstone bosons from some spontaneously broken global symmetries with the decay constant f. Since any global symmetry is broken at least by quantum gravitational effects, all pseudoscalars are massive. The mass scale of a pseudoscalar is determined by the spontaneous symmetry breaking scale f of the corresponding global symmetry and the explicit breaking terms in the effective potential. The explicit breaking terms can arise from anomaly terms with some non-Abelian gauge groups among which the best-known example is the potential of the QCD axion. Even if there is no breaking terms from gauge anomalies, there can be explicit breaking terms in the potential in which case the leading term suppressed by f determines the pseudoscalar mass scale. If the breaking term is extremely small and the decay constant is trans-Planckian, the corresponding pseudoscalar can be a candidate for a quintessential axion. In the other extreme that the breaking scales are large, still the pseudo-Goldstone boson mass scales are in general smaller than the decay constants. In such a case, still the potential of the pseudo-Goldstone boson at the grand unification scale is sufficiently flat near the top of the potential that it can be a good candidate for an inflationary model. We review these ideas in the bosonic collective motion framework. c 2017 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution
URI
https://pr.ibs.re.kr/handle/8788114/3871
ISSN
2218-1997
Appears in Collections:
Center for Axion and Precision Physics Research(액시온 및 극한상호작용 연구단) > Journal Papers (저널논문)
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