Evading the CMB -distortion bound on Supermassive Primordial Black Hole seeds with Non-Gaussian tails
This paper demonstrates that the CMB -distortion bound, which typically precludes the formation of supermassive primordial black hole seeds via Gaussian perturbations, can be evaded by invoking non-Gaussian probability distribution tails—specifically power-law or sufficiently heavy log-normal shapes—that decouple the small-scale variance from the collapse probability.