Reheating Temperature and Gauge Mediation Models of Supersymmetry Breaking

TL;DR

This paper explores how gauge mediation models of supersymmetry can reconcile high reheating temperatures with big bang nucleosynthesis constraints, especially with certain next-to-lightest superpartners, supporting leptogenesis.

Contribution

It demonstrates that generalized gauge mediation models can achieve high reheating temperatures compatible with BBN and leptogenesis, addressing a key tension in supersymmetric cosmology.

Findings

Degenerate gaugino masses maximize reheating temperature.

Models with stau or sneutrino NLSPs have relaxed BBN constraints.

Parameter space consistent with leptogenesis is identified.

Abstract

For supersymmetric theories with gravitino dark matter, the maximal reheating temperature consistent with big bang nucleosynthesis bounds arises when the physical gaugino masses are degenerate. We consider the cases of a stau or sneutrino next-to-lightest superpartner, which have relatively less constraint from big bang nucleosynthesis. The resulting parameter space is consistent with leptogenesis requirements, and can be reached in generalized gauge mediation models. Such models illustrate a class of theories that overcome the well-known tension between big bang nucleosynthesis and leptogenesis.