Supersymmetric dark matter, catalyzed BBN, and heavy moduli in mSUGRA with gravitino LSP and stau NLSP

TL;DR

This paper investigates a supersymmetric model where gravitino dark matter and stau catalysis of Big Bang nucleosynthesis are studied, considering various production mechanisms and their cosmological constraints.

Contribution

It provides a comprehensive analysis of gravitino production in mSUGRA with a focus on the interplay between dark matter, BBN, and reheating temperature constraints.

Findings

Gravitino LSP can account for dark matter under certain conditions.

Stau NLSP can catalyze BBN to reconcile observational discrepancies.

Reheating temperature bounds are incompatible with dark matter abundance constraints.

Abstract

In mSUGRA model we assume that gravitino, the LSP, plays the role of cold dark matter in the universe, while the lightest stau, the NLSP, catalyzes primordial BBN reconciling the discrepancy between theory and observations. We have taken into account all gravitino production mechanisms, namely decay from heavy scalar fields, decay from the NLSP, and from the thermal bath. We find that the dark matter constraint is incompatible with the lower bound on the reheating temperature