Revisiting Singlet Fermion Dark Matter with a Scalar Portal: Connecting Higgs Phenomenology and Strong Electroweak Phase Transition

Abstract

We investigate a minimal extension of the Standard Model with a real singlet scalar and a singlet Dirac fermion acting as dark matter. Unlike a conventional singlet scalar setup, we assume that the singlet scalar does not acquire a vacuum expectation value at zero temperature. This decouples the scalar mixing angle from the Higgs-portal quartic coupling responsible for the strong first-order electroweak phase transition, allowing it to coexist with current collider and direct-detection constraints. The Higgs-singlet mixing is generated independently through a trilinear portal interaction. We check theoretical consistency conditions, various LHC limits on heavy scalar resonances, dark matter relic abundance, and direct detection bounds to delineate the viable parameter space. We perform a detailed analysis of the electroweak phase transition and show that a strong first-order transition is realized for a selected set of benchmark points. We further compute the resulting stochastic gravitational wave spectra and find that several scenarios yield signals potentially observable at future space-based interferometers. Our results establish a unified and testable framework that connects collider phenomenology, first-order electroweak phase transition, and the resulting production of gravitational waves, along with the dark matter phenomenology, all within a simple renormalizable extension of the Standard Model.

This version matches with the accepted JCAP version; 39 pages including references, 8 figures

References in corpus (41)

• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Advanced LIGO
• FeynRules - Feynman rules made easy
• LHC Phenomenology of an Extended Standard Model with a Real Scalar Singlet
• Singlet Higgs Phenomenology and the Electroweak Phase Transition
• Gravitational Waves from Phase Transitions at the Electroweak Scale and Beyond
• A detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery
• Status of the Higgs Singlet Extension of the Standard Model after LHC Run 1
• Minimal Extension of the Standard Model Scalar Sector
• Singlet-Catalyzed Electroweak Phase Transitions and Precision Higgs Studies
• On Effective Degrees of Freedom in the Early Universe
• Theoretical uncertainties for cosmological first-order phase transitions
• Dark Matter Search Results from 4.2 Tonne-Years of Exposure of the LUX-ZEPLIN (LZ) Experiment
• Exploring Resonant di-Higgs production in the Higgs Singlet Model
• Descope of the ALIA mission
• Delta r and the W-boson mass in the Singlet Extension of the Standard Model
• Singlet fermionic dark matter
• Higgs Self-Coupling as a Probe of Electroweak Phase Transition
• On the validity of perturbative studies of the electroweak phase transition in the Two Higgs Doublet model
• Consistent Use of the Standard Model Effective Potential
• micrOMEGAs 6.0: N-component dark matter
• What is the Criterion for a Strong First Order Electroweak Phase Transition in Singlet Models?
• Consistent Use of Effective Potentials
• Combination of searches for invisible decays of the Higgs boson using 139 fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV collected with the ATLAS experiment
• On the perturbative expansion at high temperature and implications for cosmological phase transitions
• Strong phase transition, dark matter and vacuum stability from simple hidden sectors
• Search for heavy resonances decaying into a pair of $Z$ bosons in the ${\ell }^{+}{\ell }^{-}{\ell }^{\prime +}{\ell }^{\prime -}$ and ${\ell }^{+}{\ell }^{-}\nu \bar{\nu }$ final states using 139 fb${}^{-1}$ of proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• The Scalar Singlet Extension of the Standard Model: Gravitational Waves versus Baryogenesis
• How arbitrary are perturbative calculations of the electroweak phase transition?
• Dark Higgs Bosons at Colliders
• Real scalar phase transitions: a nonperturbative analysis
• Electroweak Phase Transition and Gravitational Waves in the Type-II Seesaw Model
• Two Real Scalar WIMP Model in the Assisted Freeze-Out Scenario
• SMEFT effects on gravitational wave spectrum from electroweak phase transition
• Search for heavy resonances decaying into a $Z$ or $W$ boson and a Higgs boson in final states with leptons and $b$-jets in $139$fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}=13$TeV with the ATLAS detector
• Primordial Black Hole Formation via Inverted Bubble Collapse
• Electroweak phase transition confronted with dark matter detection constraints
• Prospecting bipartite Dark Matter through Gravitational Waves
• Interpreting the 95 GeV resonance in the Two Higgs Doublet Model: Implications for the Electroweak Phase Transition
• Study of entropy production due to electroweak phase transition in $Z_2$ symmetric extension of the Standard Model
• Electroweak Phase Transition, Gravitational Waves and Collider Probes in Multi-Scalar Dark Matter Scenarios