Dark matter and Standard Model reheating from conformal GUT inflation

S. Biondini (Van Swinderen Institute, University of Groningen, Nijenborgh 4, Groningen, AG, NL-9747, Netherlands) ; K. Kumar (Van Swinderen Institute, University of Groningen, Nijenborgh 4, Groningen, AG, NL-9747, Netherlands)

Spontaneous breaking of conformal symmetry has been widely exploited in successful model building of both inflationary cosmology and particle physics phenomenology. Conformal Grand Unified Theory (CGUT) inflation provides the same scalar tilt and tensor-to-scalar ratio as of Starobinsky and Higgs inflation. Moreover, it predicts a pro- ton life time compatible with the current experimental bound. In this paper, we extend CGUT to account for the production of dark matter and the reheating of the Standard Model. To this end, we introduce a hidden sector directly coupled to the inflaton, whereas the reheating of the visible sector is realized through a portal coupling between the dark particles and the Higgs boson. The masses and interactions of the dark particles and the Higgs boson are determined by the form of the conformal potential and the non-vanishing VEV of the inflaton. We provide benchmark points in the parameter space of the model that give the observed dark matter relic density and reheating temperatures compatible with the Big Bang nucleosynthesis.

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Published on:
06 July 2020
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2020 (2020)
Issue 7
Pages 1-35
DOI:
https://doi.org/10.1007/JHEP07(2020)039
arXiv:
2004.02921
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

Fulltext files: