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 · 16 January 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); OSTI
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 California, Oakland, CA (United States); Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

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

OSTI ID:: 1802181

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

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Dark matter detection in focus point supersymmetry Draper, Patrick; Feng, Jonathan L.; Kant, Philipp Physical Review D, Vol. 88, Issue 1 https://doi.org/10.1103/PhysRevD.88.015025	journal	July 2013
A no-scale supergravity framework for sub-Planckian physics Ellis, John; Nanopoulos, Dimitri V.; Olive, Keith A. Physical Review D, Vol. 89, Issue 4 https://doi.org/10.1103/PhysRevD.89.043502	journal	February 2014
Closing in on the tip of the CMSSM stau coannihilation strip Desai, Nishita; Ellis, John; Luo, Feng Physical Review D, Vol. 90, Issue 5 https://doi.org/10.1103/PhysRevD.90.055031	journal	September 2014
One-loop corrections to neutralino-stop coannihilation revisited Harz, J.; Herrmann, B.; Klasen, M. Physical Review D, Vol. 91, Issue 3 https://doi.org/10.1103/PhysRevD.91.034028	journal	February 2015
Anatomy of coannihilation with a scalar top partner Ibarra, A.; Pierce, A.; Shah, N. R. Physical Review D, Vol. 91, Issue 9 https://doi.org/10.1103/PhysRevD.91.095018	journal	May 2015
NLSP gluino and NLSP stop scenarios from b − τ Yukawa unification Raza, Shabbar; Shafi, Qaisar; Ün, Cem Salih Physical Review D, Vol. 92, Issue 5 https://doi.org/10.1103/PhysRevD.92.055010	journal	September 2015
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Nonthermal dark matter from modified early matter domination Allahverdi, Rouzbeh; Osiński, Jacek K. Physical Review D, Vol. 99, Issue 8 https://doi.org/10.1103/PhysRevD.99.083517	journal	April 2019
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Resurrecting no-scale supergravity phenomenology Ellis, John; Mustafayev, Azar; Olive, Keith A. The European Physical Journal C, Vol. 69, Issue 1-2 https://doi.org/10.1140/epjc/s10052-010-1400-9	journal	August 2010
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Implications of improved Higgs mass calculations for supersymmetric models Buchmueller, O.; Dolan, M. J.; Ellis, J. The European Physical Journal C, Vol. 74, Issue 3 https://doi.org/10.1140/epjc/s10052-014-2809-3	journal	March 2014
The extent of the stop coannihilation strip Ellis, John; Olive, Keith A.; Zheng, Jiaming The European Physical Journal C, Vol. 74, Issue 7 https://doi.org/10.1140/epjc/s10052-014-2947-7	journal	July 2014
Collider Interplay for Supersymmetry, Higgs and Dark Matter Buchmueller, O.; Citron, M.; Ellis, J. The European Physical Journal C, Vol. 75, Issue 10 https://doi.org/10.1140/epjc/s10052-015-3675-3	journal	October 2015
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