On Gravitino properties in a Conformal Supergravity Model

TL;DR

This paper explores the properties of gravitinos within a conformal supergravity framework, analyzing their stability, decay widths, and implications for dark matter and early universe constraints.

Contribution

It provides a detailed study of gravitino behavior in a conformal SUGRA model, highlighting differences from standard SUGRA and implications for cosmology.

Findings

Enhanced gravitino decay width at large dilaton scales

Implications for dark matter production via gravitino decay

Constraints on gravitino abundance from Big Bang Nucleosynthesis

Abstract

In the context of a conformal Supergravity (SUGRA) model in the Einstein frame, in which the (next to) minimal supersymmetric standard model can embedded naturally to produce chaotic inflation scenarios, we study properties of gravitino in the cases where it is stable or unstable. In the latter case, we demonstrate that for large dilaton scale factors there is an enhanced magnitude of the gravitino width, when it decays to neutralino dark matter, as compared with the standard SUGRA case. In this context, we discuss the associated consequences as far as Big Bang Nucleosynthesis constraints and avoidance of gravitino overproduction are concerned.