Baryogenesis, dark matter, and flavor structure in non-thermal moduli cosmology

Journal Article · 20 May 2019 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep05(2019)101 · OSTI ID:1611256

Chen, Mu-Chun ^[1]; Takhistov, Volodymyr ^[2]

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1. Univ. of California, Irvine, CA (United States)
2. Univ. of California, Los Angeles, CA (United States)

The appearance of scalar/moduli fields in the early universe, as motivated by string theory, naturally leads to non-thermal “moduli cosmology”. Such cosmology provides a consistent framework where the generation of radiation, baryons, and dark matter can occur while maintaining successful Big Bang Nucleosynthesis and avoiding the cosmological moduli problem. We present a relatively economical construction with moduli cosmology, building on a variety of string-inspired components (e.g. supersymmetry, discrete symmetries, Green-Schwarz anomaly cancellation). We address a range of outstanding problems of particle physics and cosmology simultaneously, including the fermion mass hierarchy and flavor puzzle, the smallness of neutrino masses, baryogenesis and dark matter. Our setup, based on discrete $$\mathbb{Z}^R_{12}$$ symmetry and anomalous U(1)_A, is void of the usual issues plaguing the Minimal Supersymmetric Standard Model, i.e. the μ-problem and the overly-rapid proton decay due to dimension-4,-5 operators. The model is compatible with SU(5) Grand Unification. The smallness of Dirac neutrino masses is automatically established by requiring the cancellation of mixed gravitational-gauge anomalies. The decay of the moduli field provides a common origin for the baryon number and dark matter abundance, explaining the observed cosmic coincidences, Ω_B ~ Ω_DM.

• Research Organization: Univ. of California, Los Angeles, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Foundation (NSF)
• Grant/Contract Number: SC0009937; PHY-1620638
• OSTI ID: 1611256
• Journal Information: Journal of High Energy Physics (Online), Vol. 2019, Issue 5; ISSN 1029-8479
• Publisher: Springer BerlinCopyright Statement
• Country of Publication: United States
• Language: English