Salvage of Too Slow Gravitinos

Abstract

Gravitinos can inherit a non-relativistic dispersion relation while propagating in a background breaking both supersymmetry and Lorentz symmetry spontaneously. This is because the longitudinal mode velocity is controlled by the sound speed in the background. It was pointed out recently by Kolb, Long and McDonough that the production of gravitinos might diverge when this sound speed vanishes. We argue that in the framework of cosmological models with linearly spontaneously broken realised supersymmetry, where the physical fermions are combinations of the vacuum goldstino and the inflatino, the gravitino longitudinal mode has a relativistic dispersion relation and therefore avoids the catastrophic production. We illustrate this in some explicit examples.

arXiv comment16 pages. This v2 matches the published version: one reference added and minor changes in the introduction

References in corpus (18)

• Towards the Theory of Reheating After Inflation
• Gravitino Production After Inflation
• Superconformal Symmetry, Supergravity and Cosmology
• Thermal and Non-Thermal Production of Gravitinos in the Early Universe
• Non-Thermal Production of Dangerous Relics in the Early Universe
• Coupled fields in external background with application to nonthermal production of gravitinos
• Nonthermal production of gravitinos and inflatinos
• Cosmology with orthogonal nilpotent superfields
• Catastrophic Production of Slow Gravitinos
• The goldstone and goldstino of supersymmetric inflation
• Slow and Safe Gravitinos
• Nonthermal Gravitino Production after Large Field Inflation
• Inflation from Supersymmetry Breaking
• Minimal Supergravity Inflation without Slow Gravitino
• The Slow Gravitino
• Quantization of the massive gravitino on FRW spacetimes
• The Super-Higgs Mechanism in Fluids
• The Gravitino Swampland Conjecture

Cited by in corpus (6)

• Snowmass2021 Cosmic Frontier White Paper: Ultraheavy particle dark matter
• Yoga Dark Energy: Natural Relaxation and Other Dark Implications of a Supersymmetric Gravity Sector
• Quantum interference in gravitational particle production
• Geometry of orientifold vacua and supersymmetry breaking
• Causality constraints on nonlinear supersymmetry
• Constrained Superfields in Dynamical Background