Suppressing gravitino thermal production with a temperature-dependent messenger coupling
High Energy Physics - Phenomenology
2016-03-23 v1
Abstract
We show that the constraints on GMSB theories from the gravitino cosmology can be significantly relaxed if the messenger-spurion coupling is temperature dependent. We demonstrate this novel mechanism in a scenario in which this coupling depends on the VEV of an extra singlet field that interacts with the thermalized plasma which can result in a significantly suppressed gravitino production rate. In such a scenario the relic gravitino abundance is determined by the thermal dynamics of the field and it is easy to fit the observed dark matter abundance evading the stringent constraints on the reheating temperature, thus making gravitino dark matter consistent with thermal leptogenesis.
Keywords
Cite
@article{arxiv.1512.06795,
title = {Suppressing gravitino thermal production with a temperature-dependent messenger coupling},
author = {Marcin Badziak and Ioannis Dalianis and Zygmunt Lalak},
journal= {arXiv preprint arXiv:1512.06795},
year = {2016}
}
Comments
27 pages, 6 figures, 3 tables, plain text