The Higgs Portal to Cosmology

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.

115 pages. Review commissioned by Prog. Part. Nucl. Phys. Contains technicalities. v2: accepted version (typos fixed, references updated). v4: footnotes clarifying the assumption a0=1 in Sec. 8.3, 8.4 added; typos in eqs. 256 and 266 corrected; corrections to eqs. 331,333

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• Gravitational Portals with Non-Minimal Couplings
• Dark matter as a Weyl geometric effect
• Observational Constraints and Cosmological Implications of Scalar-Tensor $f(R,T)$ Gravity
• Freezing-in a hot bath: resonances, medium effects and phase transitions
• Dark energy and accelerating cosmological evolution from osculating Barthel-Kropina geometry
• Gravitationally induced particle production in scalar-tensor $f(R,T)$ gravity
• Collider Searches for Dark Matter through the Higgs Lens
• Dark matter production via a non-minimal coupling to gravity
• Scalar and Fermion Two-component SIMP Dark Matter with an Accidental ${\mathbb{Z}}_4^{}$ Symmetry
• Scalar overproduction in standard cosmology and predictivity of non-thermal dark matter
• Exotic Higgs Decays
• Observational constraints on the interacting dark energy - dark matter (IDM) cosmological models
• Dark matter from a complex scalar singlet: The role of dark CP and other discrete symmetries
• From QFT to Boltzmann: Freeze-in in the presence of oscillating condensates
• Vector dark matter and LHC constraints, including a 95 GeV light Higgs boson
• Cancellation mechanism of dark matter direct detection in Higgs-portal and vector-portal models
• Vacuum stability in the Standard Model with vector-like fermions
• Dark matter production and reheating via direct inflaton couplings: collective effects
• Primordial Black Holes and Scalar-induced Gravitational Waves in Radiative Hybrid Inflation
• Gravitational production of sterile neutrinos
• Electroweak Asymmetric Early Universe via a Scalar Condensate
• Invisible Higgs decay from dark matter freeze-in at stronger coupling
• Dissipation of oscillating scalar backgrounds in an FLRW universe
• One-loop Corrections to the Higgs Boson Invisible Decay in a Complex Singlet Extension of the SM
• Probing Higgs portals with matrix-element based kinematic discriminants in $ZZ\to 4\ell$ production
• Sterile neutrino dark matter: relativistic freeze-out
• Axionic Festina Lente
• Ultraviolet freeze-in baryogenesis
• Thermal and nonthermal dark matters with gravitational neutrino reheating
• Modified hybrid inflation, reheating and stabilization of the electroweak vacuum
• Non-thermal production of heavy vector dark matter from relativistic bubble walls
• Higgs-portal dark matter from non-supersymmetric strings
• Inflaton freeze-out
• Dark matter as the source of neutrino mass: theory overview and experimental prospects
• Freezing-in Cannibal Dark Sectors
• Supercooled Dark Scalar Phase Transitions explanation of NANOGrav data
• Induced spontaneous symmetry breaking chain
• Gravitational waves from a curvature-induced phase transition of a Higgs-portal dark matter sector
• Dark Matter and Neutrino Masses in a Portalino-like Model
• Indirect detection of long-lived particles in a rich dark sector with a dark vector portal
• Higgs vacuum metastability in $R+R^2$ gravity
• Secluded Dark Composites and Remnant Binding Fields
• Boltzmann Equation Solver for Thermalization
• On gravitational preheating