Fermionic dark matter halos around supermassive black holes can form non-power-law spikes or even density depletions, depending on the fermion mass and degeneracy, instead of the universal r^-3/2 spike of power-law halos.
Merritt, Evolution of the dark matter distribution at the galactic center, Physical Review Letters 92, 201304 (2004)
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Fermionic Dark Matter spikes: origin and growth of Black Hole seeds
Fermionic dark matter halos around supermassive black holes can form non-power-law spikes or even density depletions, depending on the fermion mass and degeneracy, instead of the universal r^-3/2 spike of power-law halos.