2025/04/23 by Yamashita, Kimiko
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2504.16525
We consider gravitational positivity bounds on the Higgs-portal scalar dark matter model. Applying gravitational positivity bounds with dark matter forward scattering process ϕϕ→ ϕϕ to this DM model, we find that the new physics, besides the Higgs-portal dark matter physics, arises at an energy scale lower than 1010 GeV without the dark matter self-coupling. With the existence of the dark matter self-coupling, the hierarchical order of magnitude between the self-coupling λϕ and the Higgs-portal coupling λhϕ changes the game. With λϕ/λhϕ = 1012, the GUT scale cutoff can realize. In this case, the dark freezeout scenario is possible for realizing the relic density of dark matter in the Universe. We find that λϕ ∼ O(1), λhϕ ∼ 10-12, and sub-GeV dark matter is implicated for the GUT scale cutoff possibility with the Higgs-portal dark matter model.