Update on scalar singlet dark matter

Abstract

One of the simplest models of dark matter is that where a scalar singlet field S comprises some or all of the dark matter, and interacts with the standard model through an HHSS coupling to the Higgs boson. We update the present limits on the model from LHC searches for invisible Higgs decays, the thermal relic density of S, and dark matter searches via indirect and direct detection. We point out that the currently allowed parameter space is on the verge of being significantly reduced with the next generation of experiments. We discuss the impact of such constraints on possible applications of scalar singlet dark matter, including a strong electroweak phase transition, and the question of vacuum stability of the Higgs potential at high scales.

18 pages, 10 figures. v2: small updates to references and discussion, including a brief passage on continuum gamma rays from the Galactic Centre; matches the version accepted for publication in PRD. v3: updated references to match final published version. v4: corrected CTA observing time, improved clarity of Fermi CL/p-value description. v5: corrected central value of coupling f_N

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• Cosmological Dark Matter in a Conformal Model
• SU(5) unification of two triplet seesaw and leptogenesis with dark matter and vacuum stability
• Probing Effective Field Theory Approach in the CP Violating Minimal Linear $\sigma$ Model
• Higgs-Portal Spin-1 Dark Matter with Parity-Violating Interaction
• Constraining the scalar singlet and inert dark matter models using neutron stars
• Vector Higgs-Portal Dark Matter: How UV Completion Reopens Viable Parameter Space
• Revisiting Singlet Fermion Dark Matter with a Scalar Portal: Connecting Higgs Phenomenology and Strong Electroweak Phase Transition
• Boosting Invisible Higgs Searches by Tagging a Gluon Jet for Gluon Fusion Process
• Identifying Minimal Composite Dark Matter
• On the Realization of WIMPflation
• Dark matter cosmic string in the gravitational field of a black hole
• Trail of the Higgs in the primordial spectrum
• Spin-one dark matter and gamma ray signals from the galactic center
• The $B$ Anomalies, the $U_1$ Leptoquark and Dark Matter
• Dark matter in three-Higgs-doublet models with $S_3$ symmetry
• Extended Higgs-portal dark matter and the Fermi-LAT Galactic Center Excess
• Theoretical and Experimental Constraints on ${\mathbb{Z}}_{2n}$ Multi-Component Dark Matter Models
• Reviving $Z^{\prime }$ Portal Dark Matter with Conversion Mechanism
• Semi-Annihilating Wino-Like Dark Matter
• Dark matter in minimal dimensional transmutation with multicritical-point principle
• Dark Matter and Muon $g-2$ Anomaly via Scale Symmetry Breaking
• Long-lived particle phenomenology in one-loop neutrino mass models with dark matter
• LHC-friendly freeze-in dark matter via Higgs portal
• Higgs particles interacting via a scalar Dark Matter field