Cosmological aspects of gauge mediated supersymmetry breakdown

TL;DR

This thesis explores how gauge mediated supersymmetry breaking models address key cosmological issues, showing they naturally avoid certain problems and can explain dark matter without extra assumptions.

Contribution

It demonstrates that general gauge mediation models inherently resolve metastable vacuum and gravitino overproduction problems, and links gravitinos to dark matter.

Findings

Metastable vacuum selection is naturally resolved.

Gravitino overproduction issues are absent in general models.

Gravitinos can account for the universe's dark matter.

Abstract

In this thesis, we study the details of some fundamental cosmological problems of the gauge mediated supersymmetry breakdown and we probe the supersymmetry breaking sector by cosmological arguments. We manifest that problems like the metastable vacuum selection and the gravitino overproduction in the reheated early universe are naturally absent in the most general class of gauge mediation models without including additional ingredients or assumptions. We also find that the gravitino can generically account for the bulk dark matter of the universe. Cosmological implications of a stringy UV-completion of the supersymmetry breaking sector have been also considered.