Tingwei Shen, Xuejian Shen, Huangyu Xiao, Mark Vogelsberger, Fangzhou Jiang

| Summary:

[[{“value”:”Observations of supermassive black holes (SMBHs) at high redshifts challenge
standard seeding scenarios. We examine a dissipative self-interacting dark
matter (dSIDM) model in which gravothermal collapse leads to the formation of
massive BH seeds ab initio. We utilize a semi-analytical framework to predict
properties of the dSIDM-seeded SMBH population. Billion solar mass quasars are
reproduced along with low-mass faint active galactic nuclei (known as little
red dots) with SMBH-to-galaxy stellar mass ratios consistent with recent James
Webb Space Telescope observations. To match the abundance of the observed
bright quasars, a percent-level duty-cycle is suggested, implying a large
population of dormant SMBHs. The gravitational wave (GW) signals from mergers
of these massive SMBHs can be detected by LISA while remaining within the
NANOGrav constraints on the GW background. These results provide testable
signatures of DM-driven SMBH formation, offering a pathway to probe
hidden-sector physics through SMBH and GW observables.”}]] 

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