Superstring-Inspired Particle Cosmology: Inflation, Neutrino Masses, Leptogenesis, Dark Matter & the SUSY Scale

Abstract

We develop a string-inspired model for particle cosmology, based on a flipped SU(5)$\times$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 [1], a key rôle is played by a superpotential coupling between the inflaton, matter and GUT Higgs fields, called ${\lambda }_6$. We scan over possible values of ${\lambda }_6$, 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 $\sim 1$ MeV restricts the supersymmetry-breaking scale to a range $\mathcal{O}(10)$ TeV that is consistent with the absence of supersymmetric particles at the LHC.

33 pages, 13 figures

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Cited by in corpus (13)

• BICEP/Keck Constraints on Attractor Models of Inflation and Reheating
• Inflation and Leptogenesis in High-Scale Supersymmetry
• Flipped SU(5) GUT Phenomenology: Proton Decay and $g_{\mu }-2$
• Flipped $g_{\mu }-2$
• Resolving the $(g-2{)}_{\mu }$ Discrepancy with $\mathcal{F}$-$SU$(5) Intersecting D-branes
• Particle physics and cosmology of the string derived no-scale flipped $SU(5)$
• Gravitino Thermal Production, Dark Matter, and Reheating of the Universe
• Observable r, Gravitino Dark Matter, and Non-thermal Leptogenesis in No-Scale Supergravity
• Power law $\alpha$-Starobinsky inflation
• The Right-Handed Slepton Bulk Region for Dark Matter in Generalized No-scale $\mathcal{F}$-$SU(5)$ with Effective Super-Natural Supersymmetry
• Flipped SU(6) Unification of the $SU(3{)}_c\times SU(3{)}_L\times U(1{)}_X$ Model
• A Generic Analysis of Nucleon Decay Branching Fractions in Flipped SU(5) Grand Unification
• Gravitino thermal production