A Simultaneous Study of Dark Matter and Phase Transition: Two-Scalar Scenario

Abstract

The simplest extension of the Standard Model by only one real singlet scalar can explain the observed dark matter relic density while giving simultaneously a strongly first-order electroweak phase transition in the early universe. However, after imposing the invisible Higgs decay constraint from the LHC, the parameter space of the single scalar model shrinks to regions with only a few percent of the DM relic abundance and when adding the direct detection bound, e.g. from XENON100, it gets excluded completely. In this paper, we extend the Standard Model with two real guage singlet scalars, here $s$ and $s^{\prime }$, and show that the electroweak symmetry breaking may occur via different channels. Despite very restrictive first-order phase transition conditions for the two-scalar model in comparison to the single scalar model, there is a viable space of parameters in different phase transition channels that simultaneously explains a fraction or the whole dark matter relic density, a strongly first-order electroweak phase transition and still evading the direct detection bounds from the latest LUX/XENON experiments while respecting the invisible Higgs decay width constraint from the LHC.

arXiv comment33 pages, 4 figures, 4 tables, some references added, typos fixed

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• Filtered Dark Matter at a First Order Phase Transition
• Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios
• Filtered pseudo-scalar dark matter and gravitational waves from first order phase transition
• Strong electroweak phase transition in $t$-channel simplified dark matter models
• Strongly first-order electroweak phase transition by relatively heavy additional Higgs bosons
• Electroweak phase transition confronted with dark matter detection constraints
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• Electroweak Phase Transition in Two Scalar Singlet Model with pNGB Dark Matter
• Electroweak Phase Transition, Gravitational Waves and Collider Probes in Multi-Scalar Dark Matter Scenarios
• Revisiting Singlet Fermion Dark Matter with a Scalar Portal: Connecting Higgs Phenomenology and Strong Electroweak Phase Transition