Affleck-Dine leptogenesis with varying Peccei-Quinn scale

Bae, Kyu Jung; Baer, Howard A.; Hamaguchi, Koichi; Nakayama, Kazunori

doi:10.1007/jhep02(2017)017

Affleck-Dine leptogenesis with varying Peccei-Quinn scale

Journal Article · Fri Feb 03 00:00:00 EST 2017 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep02(2017)017· OSTI ID:1777468

Bae, Kyu Jung ^[1]; ^[2]; Hamaguchi, Koichi ^[3]; Nakayama, Kazunori ^[3]

Inst. for Basic Science (IBS), Daejeon (Korea); University of Oklahoma
Univ. of Oklahoma, Norman, OK (United States)
Univ. of Tokyo (Japan); Univ. of Tokyo, Kashiwa (Japan)

The Affleck-Dine leptogenesis scenario along the LH _u flat direction is recon- sidered. 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Oklahoma, Norman, OK (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0009956

OSTI ID:: 1777468

Alternate ID(s):: OSTI ID: 22658960

Report Number(s):: arXiv:1612.02511

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 2 Vol. 2017; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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