Dark Matter and Electroweak Baryogenesis with Spontaneous $CP$ Violation in the Early Universe

Abstract

Dark matter (DM) and the baryon asymmetry of the universe (BAU) are among the most compelling indications of physics beyond the Standard Model. We revisit the inelastic Higgs-portal complex singlet, a minimal framework in which a complex scalar splits into two nearly degenerate real states, with an off-diagonal Higgs-portal interaction that drives coannihilation to set the relic density, while the elastic DM-Higgs coupling can be tuned small enough to evade direct-detection limits. This setup naturally supports a strong first-order electroweak phase transition (SFOEWPT) and can account for the long-standing Galactic Center gamma-ray excess (GCE) via present-day DM annihilation into Higgs pairs. In this work, we show that the same framework, extended by a $Z_2$-symmetric dimension-6 $CP$-violating top Yukawa operator, can also generate the BAU via the electroweak baryogenesis (EWBG) mechanism. The cosmological history involves a two-step electroweak phase transition: first, the singlet fields acquire nonzero vacuum expectation values (vevs); then a strongly first-order transition occurs in which the Higgs develops its nonzero vev while the singlet vevs vanish. During this second step, both fields remain nonzero only within the advancing bubble wall, generating wall-localized $CP$ violation that biases sphaleron transitions and enables EWBG. After the phase transition, $CP$ and $Z_2$ symmetries are restored: the lightest singlet state becomes a stable DM candidate, while the vanishing singlet vevs allow the model to naturally satisfy the stringent constraints on $CP$ violation. We delineate the SFOEWPT-favored parameter space, identifying the criteria for the two-step phase transition region that simultaneously yields the observed BAU and relic density, explains the GCE, and predicts gravitational wave spectra accessible to next-generation space-based detectors.

36 pages, 6 figures, 1 table, published version, references added

References in corpus (156)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Planck 2015 results. XIII. Cosmological parameters
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Particle Dark Matter: Evidence, Candidates and Constraints
• Supersymmetric Dark Matter
• Dark Matter Search Results from a One Tonne$\times$Year Exposure of XENON1T
• Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
• Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron
• Gauge Singlet Scalars as Cold Dark Matter
• The Minimal Model of Nonbaryonic Dark Matter: A Singlet Scalar
• Science with the space-based interferometer eLISA. II: Gravitational waves from cosmological phase transitions
• Cosmological Backgrounds of Gravitational Waves
• Resonant Leptogenesis
• The Waning of the WIMP? A Review of Models, Searches, and Constraints
• Progress in Electroweak Baryogenesis
• Gravitational Radiation from First-Order Phase Transitions
• Electroweak baryogenesis
• Dark Matter Annihilation in The Galactic Center As Seen by the Fermi Gamma Ray Space Telescope
• Is There a Hot Electroweak Phase Transition at $m_H\gsim m_W$?
• First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment
• Baryogenesis from Flat Directions of the Supersymmetric Standard Model
• Implication of neutrino backgrounds on the reach of next generation dark matter direct detection experiments
• Measurement of the permanent electric dipole moment of the neutron
• Energy Budget of Cosmological First-order Phase Transitions
• Primordial Nucleosynthesis in the Precision Cosmology Era
• The Effective Potential and First-Order Phase Transitions: Beyond Leading Order
• Update on scalar singlet dark matter
• Gravitational Wave Production by Collisions: More Bubbles
• Gravitational waves from the sound of a first order phase transition
• Numerical simulations of acoustically generated gravitational waves at a first order phase transition
• The Electroweak Phase Transition: A Non-Perturbative Analysis
• Electroweak Baryogenesis
• On The Origin Of The Gamma Rays From The Galactic Center
• The Characterization of the Gamma-Ray Signal from the Central Milky Way: A Compelling Case for Annihilating Dark Matter
• LHC Phenomenology of an Extended Standard Model with a Real Scalar Singlet
• Gravitational Radiation from Colliding Vacuum Bubbles: Envelope Approximation to Many-Bubble Collisions
• The stochastic gravitational wave background from turbulence and magnetic fields generated by a first-order phase transition
• CosmoTransitions: Computing Cosmological Phase Transition Temperatures and Bubble Profiles with Multiple Fields
• Detection methods for stochastic gravitational-wave backgrounds: a unified treatment
• Improved limit on the permanent electric dipole moment of 199Hg
• Detection of a Gamma-Ray Source in the Galactic Center Consistent with Extended Emission from Dark Matter Annihilation and Concentrated Astrophysical Emission
• Implications of LHC searches for Higgs--portal dark matter
• Background model systematics for the Fermi GeV excess
• Singlet Higgs Phenomenology and the Electroweak Phase Transition
• Shape of the acoustic gravitational wave power spectrum from a first order phase transition
• Missing Energy Signatures of Dark Matter at the LHC
• Dark Matter and Pulsar Model Constraints from Galactic Center Fermi-LAT Gamma Ray Observations
• Gravitational Waves from Phase Transitions at the Electroweak Scale and Beyond
• Standard Model CP-violation and Baryon asymmetry
• First Dark Matter Search with Nuclear Recoils from the XENONnT Experiment
• Electroweak Baryogenesis and Standard Model CP Violation
• Strong Electroweak Phase Transitions in the Standard Model with a Singlet
• Endpoint of the hot electroweak phase transition
• The Fermi Galactic Center GeV Excess and Implications for Dark Matter
• Dark Matter Benchmark Models for Early LHC Run-2 Searches: Report of the ATLAS/CMS Dark Matter Forum
• Fermi-LAT Observations of High-Energy Gamma-Ray Emission Toward the Galactic Center
• The Sphaleron Rate in the Minimal Standard Model
• Astrophysical and Dark Matter Interpretations of Extended Gamma-Ray Emission from the Galactic Center
• Standard Model CP-violation and Baryon asymmetry Part II: Finite Temperature
• Resummation in a Hot Scalar Field Theory
• Exotic Decays of the 125 GeV Higgs Boson
• Simplified Models for Dark Matter Searches at the LHC
• Complex Singlet Extension of the Standard Model
• On the Maximal Strength of a First-Order Electroweak Phase Transition and its Gravitational Wave Signal
• Gravitational wave generation from bubble collisions in first-order phase transitions: an analytic approach
• Stochastic Gravitational Wave Backgrounds
• Electroweak Bubble Wall Speed Limit
• Evidence for Unresolved Gamma-Ray Point Sources in the Inner Galaxy
• Gravitational waves from stochastic relativistic sources: primordial turbulence and magnetic fields
• On the Validity of the Effective Field Theory for Dark Matter Searches at the LHC
• Dark Energy Survey Year 1 Results: A Precise H0 Measurement from DES Y1, BAO, and D/H Data
• Baryogenesis in the Two-Higgs Doublet Model
• Probing Light Thermal Dark-Matter With a Higgs Portal Mediator
• Electroweak baryogenesis and dark matter from a singlet Higgs
• Gravitational Baryogenesis
• Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1T
• Baryon Asymmetry of the Universe in the Minimal Standard Model
• Dark Matter through the Higgs portal
• Baryon Asymmetry of the Universe in the Standard Model
• Electroweak Baryogenesis in Supersymmetric Models
• Cosmic phase transitions: their applications and experimental signatures
• Decay and Detection of a Light Scalar Boson Mixing with the Higgs
• Supersymmetric Electroweak Baryogenesis
• Electroweak baryogenesis and gravitational waves from a real scalar singlet
• Sound shell model for acoustic gravitational wave production at a first-order phase transition in the early Universe
• Electroweak Baryogenesis in Two Higgs Doublet Models and B meson anomalies
• Complex Scalar Singlet Dark Matter: Vacuum Stability and Phenomenology
• Dark Matter Searches at Colliders
• Gravitational waves from first-order cosmological phase transitions: lifetime of the sound wave source
• Status of the scalar singlet dark matter model
• Vorticity, kinetic energy, and suppressed gravitational wave production in strong first order phase transitions
• Gravitational waves from a first order electroweak phase transition: a brief review
• Gravitational waves from first order cosmological phase transitions in the Sound Shell Model
• GeV excess in the Milky Way: The Role of Diffuse Galactic gamma ray Emission template
• Search for new phenomena in events with an energetic jet and missing transverse momentum in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Non-local Electroweak Baryogenesis Part II : The Classical Regime
• The Gravitational-Wave Physics
• Discovery of a Ringlike Dark Matter Structure in the Core of the Galaxy Cluster Cl 0024+17
• A unified explanation for dark matter and electroweak baryogenesis with direct detection and gravitational wave signatures
• Numerical Simulations of Gravitational Waves from Early-Universe Turbulence
• The electroweak phase transition with a singlet
• Measuring the Broken Phase Sphaleron Rate Nonperturbatively
• The Baryon asymmetry in the Standard Model with a low cut-off
• Soft Leptogenesis
• Supersymmetric Electroweak Baryogenesis in the WKB approximation
• Electroweak Baryogenesis in Non-minimal Composite Higgs Models
• Standard Model CP-violation and Baryon asymmetry Part I: Zero Temperature
• Dynamics of Electroweak Phase Transition In Singlet-Scalar Extension of the Standard Model
• Gravitional radiation from first-order phase transitions in the presence of a fluid
• Electroweak Baryogenesis from a Classical Force
• The endpoint of the first-order phase transition of the SU(2) gauge-Higgs model on a 4-dimensional isotropic lattice
• The characteristics of the Galactic center excess measured with 11 years of Fermi-LAT data
• Standard Model with a Complex Scalar Singlet: Cosmological Implications and Theoretical Considerations
• Assisted freeze-out
• Detectability of Gravitational Waves from Phase Transitions
• Electroweak baryogenesis at high wall velocities
• Strong electroweak phase transitions without collider traces
• Gravitational Radiation Generated by Cosmological Phase Transition Magnetic Fields
• Impact of a complex singlet: From dark matter to baryogenesis
• Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Gravitational Radiation from Primordial Helical Inverse Cascade MHD Turbulence
• 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
• Computing the Strong Sphaleron Rate
• Reopening the Higgs portal for Singlet Scalar Dark Matter
• Baryogenesis and gravity waves from a UV-completed electroweak phase transition
• Search for invisible Higgs-boson decays in events with vector-boson fusion signatures using 139 ${\text{fb}}^{-1}$ of proton-proton data recorded by the ATLAS experiment
• Top transport in electroweak baryogenesis
• Search for invisible decays of the Higgs boson produced via vector boson fusion in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• The Return of the Templates: Revisiting the Galactic Center Excess with Multi-Messenger Observations
• Gravitational waves from first-order phase transitions in LISA: reconstruction pipeline and physics interpretation
• The Scalar Singlet Extension of the Standard Model: Gravitational Waves versus Baryogenesis
• Vacuum Bubbles in the Presence of a Relativistic Fluid
• Axial Currents from CKM Matrix CP Violation and Electroweak Baryogenesis
• Spontaneous CP Violation and Baryogenesis in the Minimal Supersymmetric Standard Model
• Polarized Gravitational Waves from Cosmological Phase Transitions
• Spontaneous $CP$-Violating Electroweak Baryogenesis and Dark Matter from a Complex Singlet Scalar
• Light Dark Matter through Assisted Annihilation
• Domain walls seeding the electroweak phase transition
• A search for decays of the Higgs boson to invisible particles in events with a top-antitop quark pair or a vector boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Resummation Methods at Finite Temperature: The Tadpole Way
• Off-shell Higgs Probe to Naturalness
• Nucleation is More than Critical -- A Case Study of the Electroweak Phase Transition in the NMSSM
• Gravitational Waves, Bubble Profile, and Baryon Asymmetry in the Complex 2HDM
• Higgs Couplings at High Scales
• Investigating the effect of Milky Way dwarf spheroidal galaxies extension on dark matter searches with Fermi-LAT data
• A Systematic Study of Hidden Sector Dark Matter: Application to the Gamma-Ray and Antiproton Excesses
• New Emerging Results in Higgs Precision Analysis Updates 2018 after Establishment of Third-Generation Yukawa Couplings
• Decays of Higgs Bosons in the Standard Model and Beyond
• Electroweak Cogenesis
• CP Violation at the Finite Temperature
• Electroweak Phase Transition with a Double Well Done Doubly Well
• Heavy long-lived coannihilation partner from inelastic Dark Matter model and its signatures at the LHC
• Probing feebly interacting dark matter with monojet searches
• Do We Understand the Sphaleron Rate?
• Electroweak-like Baryogenesis with New Chiral Matter

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