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Affleck-Dine leptogenesis with varying Peccei-Quinn scale

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Title
Affleck-Dine leptogenesis with varying Peccei-Quinn scale
Author(s)
Kyu Jung Bae; Howard Baer; Koichi Hamaguchi; Kazunori Nakayama
Publication Date
2017-02
Journal
JOURNAL OF HIGH ENERGY PHYSICS, v.2017, no.2, pp.017 -
Publisher
SPRINGER
Abstract
The Affleck-Dine leptogenesis scenario along the LHu flat direction is reconsidered. It is known that successful Affleck-Dine leptogenesis requires that the lightest neutrino mass is extremely small. This situation can be significantly relaxed if the neutrino mass in the early universe is different from the present one. We consider a supersymmetric Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) type model, which provides a solution to the strong CP problem and generates a SUSY μ-term and right-handed neutrino masses. If the PQ scale during lepton number generation is much larger than the present value, leptogenesis is very efficient so that enough baryon number can be generated without introducing a hierarchically small neutrino mass. The final baryon asymmetry is related to the μ-term, and hence linked to the level of electroweak fine-tuning. We also show the PQ breaking scalar dynamics that keeps a large PQ breaking scale during inflation and lepton number generation. The μ-term generating superpotential plays an important role for preserving the lepton asymmetry during saxion oscillation. In this scenario, the axion isocurvature perturbation is naturally suppressed. © 2017, The Author(s)
URI
http://pr.ibs.re.kr/handle/8788114/3357
DOI
10.1007/JHEP02(2017)017
ISSN
1029-8479
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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