Cosmological implications of a B – L charged hidden scalar: leptogenesis and gravitational waves*

Journal Article · 14 September 2021 · Chinese Physics C, High Energy Physics and Nuclear Physics

DOI: https://doi.org/10.1088/1674-1137/ac1e09 · OSTI ID:1979381

Bian, Ligong ^[1]; Cheng, Wei ^[2]; Guo, Huai-Ke ^[3]; Zhang, Yongchao ^[4]

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1. Chongqing University (China); Chongqing Key Laboratory for Strongly Coupled Physics (China); OSTI
2. Chongqing University of Posts and Telecommunications (China); University of Chinese Academy of Sciences, Beijing (China)
3. University of Oklahoma, Norman, OK (United States)
4. Southeast University, Nanjing (United States); Washington University, St.Louis, MO (United States); Peking University, Beijing (United States)

In this study, we investigated the cosmological implications of a complex singlet scalar $$ {\cal{S}}$$ with non-trivial $ B-L$ charges in the conformal $$ U(1)_{B-L}$$ theory. It was found that, in a sizable region of parameter space, $$ {\cal{S}}$$ may disturb the resonant leptogenesis mechanism, which is used to generate baryon asymmetry, and affect the symmetry breaking dynamics in the strong first order phase transition. The stochastic gravitational waves (GWs) produced at the phase transition can be probed in future GW experiments. The GW searches prefer a relatively light $$ {\cal{S}}$$ at the TeV-scale; however, this is difficult to detect directly at future high-energy colliders.

• Research Organization: University of Oklahoma, Norman, OK (United States); Washington University, St. Louis, MO (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: SC0009956; SC0017987
• OSTI ID: 1979381
• Journal Information: Chinese Physics C, High Energy Physics and Nuclear Physics, Journal Name: Chinese Physics C, High Energy Physics and Nuclear Physics Journal Issue: 11 Vol. 45; ISSN 1674-1137
• Publisher: IOP PublishingCopyright Statement
• Country of Publication: United States
• Language: English