Gravitino production in a thermal Universe revisited

Abstract

We study the production of spin 1/2 gravitinos in a thermal Universe. Taking into account supersymmetry breaking due to the finite thermal energy density of the Universe, there is a large enhancement in the cross section of production of these gravitino states. We consider gravitinos with zero temperature masses of 0.1 eV, 1 keV, 100 GeV and 30 TeV as representative of gauge mediated, gravity mediated and anomaly mediated supersymmetry breaking scenarios. We find that the abundance of gravitinos produced in the early Universe is very high for gravitinos of mass 1 keV and 100 GeV. The gravitino abundances can be sufficiently suppressed if the reheat temperature is less than 100 GeV and $4\cdot 10^4$ gev respectively. However such low reheat temperatures will rule out many models of baryogenesis including those via leptogenesis.

8 pages, Revtex

References in corpus (10)

• Big-Bang Nucleosynthesis
• Thermal production of gravitinos
• Constraints on the Reheating Temperature in Gravitino Dark Matter Scenarios
• Inflaton Decay in Supergravity
• A TeV Scale Model for Baryon and Lepton Number Violation and Resonant Baryogenesis
• Inflation, baryogenesis and gravitino dark matter at ultra low reheat temperatures
• Gravitino cosmology in supersymmetric warm inflation
• Gravitino production in an inflationary Universe and implications for leptogenesis
• The Gravitino-Overproduction Problem in Inflaton Decay
• TeV Scale Leptogenesis

Cited by in corpus (3)

• Detectable Gravitational Wave Signals from Affleck-Dine Baryogenesis
• Supergravity Models with 50-100 TeV Scalars, SUSY Discovery at the LHC and Gravitino Decay Constraints
• Gravitino Thermal Production, Dark Matter, and Reheating of the Universe