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# Impact of Higgs portal on gravity-mediated production of superheavy dark matter

Chianese, Marco, Fu, Bowen and King, Stephen F. (2020) Impact of Higgs portal on gravity-mediated production of superheavy dark matter. Journal of Cosmology and Astroparticle Physics, 2020.

Record type: Article

## Abstract

In the so-called Planckian Interacting Dark Matter (PIDM) scenario, superheavy dark matter particles are produced after inflation by gravity-mediated interactions through the freeze-in mechanism. In the minimal PIDM model, the absence of any additional direct coupling with Standard Model particles is assumed. However, for scalar dark matter particles there is no symmetry that suppresses the Higgs portal coupling. In this paper, we therefore study the impact of a non-zero interaction with the Higgs field on the PIDM paradigm for scalar dark matter. In particular, we fully explore the model parameter space in order to identify the allowed regions where the correct dark matter abundance is achieved. Moreover, we provide the threshold value for the Higgs portal coupling below which the corresponding production processes are sub-dominant and the minimal PIDM scenario is preserved. For a benchmark scalar dark matter mass of $10^{15}$ GeV, we find that the Higgs portal coupling has to be smaller than $5.1 \times 10^{-8}$ ($1.1 \times 10^{-7}$) for instantaneous (non-instantaneous) reheating.

Text
2003.07366v2 - Accepted Manuscript

Published date: 16 March 2020
Additional Information: 14 pages, 5 figures. Updated to match version published in JCAP
Keywords: hep-ph

## Identifiers

Local EPrints ID: 453607
URI: http://eprints.soton.ac.uk/id/eprint/453607
ISSN: 1475-7516
PURE UUID: fc233842-1ef7-4523-be2a-933bc4d9d034
ORCID for Bowen Fu: orcid.org/0000-0003-2270-8352

## Catalogue record

Date deposited: 20 Jan 2022 17:38

## Contributors

Author: Marco Chianese
Author: Bowen Fu
Author: Stephen F. King