Closing the Mass Window for Stupendously Large Black Holes

Christopher Gerlach, Yann Gouttenoire, Antonio J. Iovino +1

We show that primordial black holes (PBHs) in the $\text{Stupendously Large Black Hole}$ mass range ($M\gtrsim 10^{11}{M}_{\odot }$) produce isocurvature perturbations exceeding cu…