Electroweak Phase Transition in Scale Invariant Standard Model

Abstract

In an extension to the scale invariant standard model by two real singlet scalars $s$ and $s^{\prime }$ in addition to the Higgs field, we investigate the strong first-order electroweak phase transition as a requirement for baryogenesis. This is the minimal extension to the scale invariant standard model with two extra degrees of freedom that possesses the physical Higgs mass of $125$ GeV. The scalar $s^{\prime }$ being stable because of the ${\mathbb{Z}}_2$ discrete symmetry is taken as the dark matter candidate. We then show that the electroweak phase transition is strongly first-order, the dark matter relic density takes the desired value ${\Omega }_{\text{DM}}{h}^2\sim 0.11$, and the constraints from direct detection experiments are respected only if $m_{s^{\prime }}\equiv m_{\text{DM}}\gtrsim 4.5$ TeV. The model also puts a lower bound on the scalon mass, $m_s\gtrsim 200$ GeV.

6 pages, 4 figures, to be published in PRD

References in corpus (7)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Results from a search for dark matter in the complete LUX exposure
• micrOMEGAs4.1: two dark matter candidates
• Effective Action, Conformal Anomaly and the Issue of Quadratic Divergences
• The Minimal Scale Invariant Extension of the Standard Model
• Fermionic dark matter with pseudo-scalar Yukawa interaction

Cited by in corpus (13)

• Collider and Gravitational Wave Complementarity in Exploring the Singlet Extension of the Standard Model
• Gravitational waves from conformal symmetry breaking
• Conformal model for gravitational waves and dark matter: A status update
• Gravitational waves from scale-invariant vector dark matter model: Probing below the neutrino-floor
• Scale-genesis by Dark Matter and Its Gravitational Wave Signal
• Scalar dark matter in the conformally invariant extension of the standard model
• Sensitivity to Dark Sector Scales from Gravitational Wave Signatures
• Higgs inflation and cosmological electroweak phase transition with N scalars in the post-Higgs era
• Weak scale from Planck scale -- Mass Scale Generation in Classically Conformal Two Scalar System --
• Conformal invariance and singlet fermionic dark matter
• Significance of soft-scale breaking on primordial black hole production in Coleman-Weinberg type supercooling-phase transition
• Vacuum Stability and Radiative Symmetry Breaking of the Scale-Invariant Singlet Extension of Type II Seesaw Model
• Vacuum stability of conformally invariant scalar dark matter models