期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/12/039
关键词
cosmological phase transitions; gravitational waves / theory; dark matter theory
资金
- DST-SERB, Government of India [ECR/2017/001873]
- National Research Foundation (NRF) [NRF-2019R1A2C1088953]
We investigate a dark SU(2)(D) gauge extension of the standard model, with the potential for a strong first order phase transition below the electroweak scale in accordance with NANOGrav 12.5 yr data. The SU(2)(D) vector bosons in the dark sector, which acquire masses as a result of the phase transition, can also serve as dark matter in the universe with relic abundance generated through non-thermal means via scalar portal mixing. Future sensitivity of gravitational wave experiments to the model parameter space is also discussed.
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.
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