TL;DR
This paper reviews how the Higgs portal, involving Higgs couplings to hidden sectors, influences cosmological phenomena like inflation, vacuum stability, and dark matter, highlighting its significance even with very small couplings.
Contribution
It provides a comprehensive overview of the cosmological implications of Higgs portal interactions, emphasizing their relevance across various cosmological scenarios.
Findings
Higgs portal interactions can affect inflationary dynamics.
Higgs portal couplings impact vacuum stability considerations.
Dark matter models are influenced by Higgs portal physics.
Abstract
The discovery of the Higgs boson has opened a new avenue for exploring physics beyond the Standard Model. In this review, we discuss cosmological aspects of the simplest Higgs couplings to the hidden sector, known as the Higgs portal. We focus on implications of such couplings for inflation, vacuum stability and dark matter, with the latter including both the traditional weakly interacting massive particles as well as feebly interacting scalars. The cosmological impact of the Higgs portal can be important even for tiny values of the couplings.
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