Leptogenesis as the source of gravitino dark matter and density perturbations

Abstract

We investigate the possibility that the entropy producing decay of a right-handed sneutrino condensate can simultaneously be the source of the baryon asymmetry, of gravitino dark matter, and of cosmological density perturbations. For generic values of soft supersymmetry breaking terms in the visible sector of 1-10 TeV, condensate decay can yield the dark matter abundance for gravitinos in the mass range 1 MeV to 1 TeV, provided that the resulting reheat temperature is below $10^6$ GeV. The abundance of thermally produced gravitinos before and after sneutrino decay is then negligible. We consider different leptogenesis mechanisms to generate a sufficient asymmetry, and find that low-scale soft leptogenesis works most naturally at such temperatures. The condensate can easily generate sufficient density perturbations if its initial amplitude is $\sim \mathcal{O}(M_{\mathrm{GUT}})$, for a Hubble expansion rate during inflation $>10^9$ GeV. Right-handed sneutrinos may therefore at the same time provide a source for baryogenesis, dark matter and the seed of structure formation.

12 pages. Cosmetic changes made and references added. Final version to appear in Phys. Rev. D

References in corpus (3)

• Some Aspects of Thermal Leptogenesis
• Sneutrino condensate as a candidate for the hot big bang cosmology
• Enhanced reheating via Bose condensates

Cited by in corpus (13)

• Dark Matter from Baryon Asymmetry
• Slepton Trapping at the Large Hadron and International Linear Colliders
• Supersymmetric Thermalization and Quasi-Thermal Universe: Consequences for Gravitinos and Leptogenesis
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• Reheating in supersymmetric high scale inflation
• Nonthermal production of baryon and dark matter
• Leptogenesis bound on neutrino masses in left-right symmetric models with spontaneous D-parity violation
• Gravitino production from reheating in split supersymmetry
• Dark world and baryon asymmetry from a common source
• Measuring the Lifetime of Trapped Sleptons Using the General Purpose LHC Detectors
• Mixed inflaton and curvaton scenario with sneutrinos
• Reheating, thermalization and non-thermal gravitino production in MSSM inflation
• Gravitino phenomenology and cosmological implications of supergravity