A first order dark $SU(2{)}_D$ phase transition with vector dark matter in the light of NANOGrav 12.5 yr data

Abstract

We study a dark $SU(2{)}_D$ gauge extension of the standard model (SM) with the possibility of a strong first order phase transition (FOPT) taking place below the electroweak scale in the light of NANOGrav 12.5 yr data. As pointed out recently by the NANOGrav collaboration, gravitational waves (GW) from such a FOPT with appropriate strength and nucleation temperature can explain their 12.5 yr data. We impose a classical conformal invariance on the scalar potential of $SU(2{)}_D$ sector involving only a complex scalar doublet with negligible couplings with the SM Higgs. While a FOPT at sub-GeV temperatures can give rise to stochastic GW around nano-Hz frequencies being in agreement with NANOGrav findings, the $SU(2{)}_D$ vector bosons which acquire masses as a result of the FOPT in dark sector, can also serve as dark matter (DM) in the universe. The relic abundance of such vector DM can be generated in a non-thermal manner from the SM bath via scalar portal mixing. We also discuss future sensitivity of gravitational wave experiments to the model parameter space.

10 pages, 6 captioned figures. accepted for publication in JCAP. arXiv admin note: substantial text overlap with arXiv:2105.01007

References in corpus (19)

• A direct empirical proof of the existence of dark matter
• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• On the evidence for a common-spectrum process in the search for the nanohertz gravitational-wave background with the Parkes Pulsar Timing Array
• Gravitational wave energy budget in strongly supercooled phase transitions
• Gravitational waves from stochastic relativistic sources: primordial turbulence and magnetic fields
• The Spectrum of Gravitational Radiation from Primordial Turbulence
• Exploring the Early Universe with Gaia and THEIA
• Gravitional radiation from first-order phase transitions in the presence of a fluid
• Searching For Gravitational Waves From Cosmological Phase Transitions With The NANOGrav 12.5-year dataset
• Bubble wall velocity: heavy physics effects
• Gravitational waves from the minimal gauged $U(1{)}_{B-L}$ model
• Hydrodynamics of phase transition fronts and the speed of sound in the plasma
• Neutral SU(2) Gauge Extension of the Standard Model and a Vector-Boson Dark-Matter Candidate
• On gauge dependence of gravitational waves from a first-order phase transition in classical scale-invariant $U(1{)}^{\prime }$ models
• The Electroweak Phase Transition in Nearly Conformal Technicolor
• An efficient approach to electroweak bubble velocities
• Gravitational waves from a dark $U(1{)}_D$ phase transition in the light of NANOGrav 12.5 yr data
• Non-Abelian Vector Dark Matter and Lepton $g-2$
• SU(2)_N Model of Vector Dark Matter with a Leptonic Connection

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