2025/04/23 by Enomoto, Seishi, Hiroshima, Nagisa, Murase, Kohta +1
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2504.17127
It is widely believed that the parameter space for Higgs-portal dark matter that achieves the relic abundance through thermal freeze-out has already been tightly constrained, typically at masses on the order of \cal O(10-100) GeV. We point out the possibility that the multiple Higgs production due to its self-interaction dramatically changes this picture. We show that the multiplicity can be as large as \cal O(200) for the parameters of the Standard Model Higgs, independently of the kinematics of the particle production process. Consequently, heavy Higgs-portal dark matter of mχ\gtrsim\cal O(1) TeV can achieve the required relic abundance in the same mechanism with that for canonical weakly interacting massive particle models.