Fangzhou Jiang, Zixiang Jiang, Haonan Zheng, Luis C. Ho, Kohei Inayoshi

| Summary:

[[{“value”:”We present a statistical study on the formation and growth of black holes
(BHs) seeded by gravothermal core-collapse of self-interacting dark matter
(SIDM) halos at high redshifts, using a semi-analytical framework based on
Monte-Carlo merger trees. We demonstrate that BH formation via gravothermal
collapse naturally occurs in high-concentration halos at a characteristic mass
scale determined by the SIDM cross section, and only during the early Universe.
This mechanism is particularly promising for explaining the abundance of little
red dots (LRDs) — a population of early, apparently galaxy-less active
galactic nuclei hosting supermassive BHs. By incorporating this seeding process
with simplified models of BH growth and mergers, we successfully reproduce the
observed LRD mass function for moderately large cross sections of $sigma_{0m}
sim 30 mathrm{cm^2,g^{-1}}$ and $omega sim 80,mathrm{km,s^{-1}}$,
intriguingly consistent with independent local constraints derived from galaxy
rotation curves. Our results highlight the potential of high-redshift BH
statistics as a complementary probe for constraining SIDM models.”}]] 

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