期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 3, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP03(2022)198
关键词
Cosmology of Theories BSM; New Light Particles
资金
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan [17H02878, 18H05542, 18K13535, 19H04609, 20H01895, 20H05860, 21H00067]
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- Advanced Leading Graduate Course for Photon Science
- JSPS Research Fellowships for Young Scientists
- International Graduate Program for Excellence in EarthSpace Science
- Grants-in-Aid for Scientific Research [20H05860, 21H00067, 20H01895, 19H04609] Funding Source: KAKEN
This study discusses the cosmological constraints on a dark scalar particle mixing with the Standard Model Higgs boson. The production process of the dark scalar when the reheating temperature of the Universe is very low is given special attention, allowing for a conservative limit on the low-mass scalar particle. The effect of the self-interaction of the dark scalars on cosmological constraints is also investigated.
We discuss cosmological constraints on a dark scalar particle mixing with the Standard Model Higgs boson. We pay particular attention to the dark scalar production process when the reheating temperature of the Universe is very low, which allows us to give a conservative limit on the low-mass scalar particle. We also study the effect of the self-interaction of the dark scalars and find this has a significant impact on the cosmological constraints. We obtain the most conservative cosmological constraint on the dark scalar, which is complementary to accelerator experiments and astrophysical observations.
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