Non-thermal Gravitino Production in Tribrid Inflation

Abstract

We investigate non-thermal gravitino production after tribrid inflation in supergravity, which is a variant of supersymmetric hybrid inflation where three fields are involved in the inflationary model and where the inflaton field resides in the matter sector of the theory. In contrast to conventional supersymmetric hybrid inflation, where non-thermal gravitino production imposes severe constraints on the inflationary model, we find that the "non-thermal gravitino problem" is generically absent in models of tribrid inflation, mainly due to two effects: (i) With the inflaton in tribrid inflation (after inflation) being lighter than the waterfall field, the latter has a second decay channel with a much larger rate than for the decay into gravitinos. This reduces the branching ratio for the decay of the waterfall field into gravitinos. (ii) The inflaton generically decays later than the waterfall field, and does not produce gravitinos when it decays. This leads to a dilution of the gravitino population from the decays of the waterfall field. The combination of both effects generically leads to a strongly reduced gravitino production in tribrid inflation.

References in corpus (9)

• Constraints on the Reheating Temperature in Gravitino Dark Matter Scenarios
• Moduli-Induced Gravitino Problem
• Moduli Decays and Gravitinos
• The Gravitino-Overproduction Problem in Inflationary Universe
• Supersymmetric Hybrid Inflation with Non-Minimal Kahler potential
• Moduli/Inflaton Mixing with Supersymmetry Breaking Field
• Solving the $\eta$-Problem in Hybrid Inflation with Heisenberg Symmetry and Stabilized Modulus
• Sneutrino Hybrid Inflation and Nonthermal Leptogenesis
• Towards Matter Inflation in Heterotic String Theory

Cited by in corpus (5)

• Sneutrino Tribrid Inflation, Metastable Cosmic Strings and Gravitational Waves
• Parametric resonance after hilltop inflation caused by an inhomogeneous inflaton field
• Starobinsky-like inflation and soft-SUSY breaking
• Gravitino Thermal Production, Dark Matter, and Reheating of the Universe
• Supergravity Contributions to Inflation in models with non-minimal coupling to gravity