Supermassive Black Holes from Ultra-Strongly Self-Interacting Dark Matter

  title={Supermassive Black Holes from Ultra-Strongly Self-Interacting Dark Matter},
  author={Jason Pollack and David N. Spergel and Paul J. Steinhardt},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
We consider the cosmological consequences if a small fraction ($f\lesssim 0.1$) of the dark matter is ultra-strongly self-interacting, with an elastic self-interaction cross-section per unit mass $\sigma\gg1\ \mathrm{cm^{2}/g}$. This possibility evades all current constraints that assume that the self-interacting component makes up the majority of the dark matter. Nevertheless, even a small fraction of ultra-strongly self-interacting dark matter (uSIDM) can have observable consequences on… 

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