Superstring-inspired particle cosmology: inflation, neutrino masses, leptogenesis, dark matter & the SUSY scale

Ellis, John; Garcia, Marcos A. G.; Nagata, Natsumi; Nanopoulos, Dimitri V.; Olive, Keith A.

doi:10.1088/1475-7516/2020/01/035

Title: Superstring-inspired particle cosmology: inflation, neutrino masses, leptogenesis, dark matter & the SUSY scale

Journal Article · Wed Jan 01 00:00:00 EST 2020 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2020/01/035· OSTI ID:1802181

Ellis, John ^[1]; Garcia, Marcos A. G. ^[2]; Nagata, Natsumi ^[3]; Nanopoulos, Dimitri V. ^[4]; Olive, Keith A. ^[5]

King's College, London (United Kingdom). Dept. of Physics. Theoretical Particle Physics and Cosmology Group; European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theoretical Physics Dept.; National Inst. of Chemical Physics and Biophysics, Tallinn (Estonia)
Instituto de Fısica Teorica (IFT) UAM-CSIC, Campus de Cantoblanco, Madrid (Spain)
Univ. of Tokyo (Japan). Dept. of Physics
Texas A & M Univ., College Station, TX (United States). George P. and Cynthia W. Mitchell Inst. for Fundamental Physics and Astronomy; Houston Advanced Research Center (HARC), Mitchell Campus, Woodlands, TX (United States). Astroparticle Physics Group; Academy of Athens (Greece). Division of Natural Sciences
Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy. William I. Fine Theoretical Physics Inst.

We develop a string-inspired model for particle cosmology, based on a flipped SU(5)×U(1) gauge group formulated in a no-scale supergravity framework. The model realizes Starobinsky-like inflation, which we assume to be followed by strong reheating, with the GUT symmetry being broken subsequently by a light ‘flaton’ field whose decay generates a second stage of reheating. We discuss the production of gravitinos and the non-thermal contribution made by their decays to the density of cold dark matter, which is assumed to be provided by the lightest neutralino. We also discuss the masses of light and heavy neutrinos and leptogenesis. As discussed previously, a key rôle is played by a superpotential coupling between the inflaton, matter and GUT Higgs fields, called λ₆. We scan over possible values of λ₆, exploring the correlations between the possible values of observables. We emphasize that the release of entropy during the GUT transition allows large regions of supersymmetry-breaking parameter space that would otherwise lead to severe overdensity of dark matter. Furthermore, we find that the Big Bang nucleosynthesis lower limit on the reheating temperature of ~ 1 MeV restricts the supersymmetry-breaking scale to a range O(10) TeV that is consistent with the absence of supersymmetric particles at the LHC.

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Research Organization:: Texas A & M Univ., College Station, TX (United States); Univ. of Minnesota, Minneapolis, MN (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010813; SC0011842; AC02-05CH11231

OSTI ID:: 1802181

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2020, Issue 01; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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