Abstract
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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Ibe, M., Kobayashi, S., Nakayama, Y. et al. Cosmological constraints on dark scalar. J. High Energ. Phys. 2022, 198 (2022). https://doi.org/10.1007/JHEP03(2022)198
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DOI: https://doi.org/10.1007/JHEP03(2022)198