%0 Generic %1 germani2023statistics %A Germani, Cristiano %A Sheth, Ravi K. %D 2023 %K tifr %T The statistics of primordial black holes in a radiation dominated Universe -- a review and new results %U http://arxiv.org/abs/2308.02971 %X We review the non-linear statistics of Primordial Black Holes that form from the collapse of over-densities in a radiation dominated Universe. We focus on the scenario in which large over-densities are generated by rare and Gaussian curvature perturbations during inflation. As new results, we show that the mass spectrum follows a power law determined by the critical exponent of the self-similar collapse up to a power spectrum dependent cut-off and, that the abundance related to very narrow power spectrums is exponentially suppressed. Related to this, we discuss and explicitly show that the Press-Schechter approximation, as well as the statistics of mean profiles, lead to wrong conclusions for the abundance and mass spectrum. Finally, we clarify that the transfer function in the statistics of initial conditions for primordial black holes formation (the abundance) does not play a significant role.

@misc{germani2023statistics, abstract = {We review the non-linear statistics of Primordial Black Holes that form from the collapse of over-densities in a radiation dominated Universe. We focus on the scenario in which large over-densities are generated by rare and Gaussian curvature perturbations during inflation. As new results, we show that the mass spectrum follows a power law determined by the critical exponent of the self-similar collapse up to a power spectrum dependent cut-off and, that the abundance related to very narrow power spectrums is exponentially suppressed. Related to this, we discuss and explicitly show that the Press-Schechter approximation, as well as the statistics of mean profiles, lead to wrong conclusions for the abundance and mass spectrum. Finally, we clarify that the transfer function in the statistics of initial conditions for primordial black holes formation (the abundance) does not play a significant role.}, added-at = {2023-08-08T04:20:29.000+0200}, author = {Germani, Cristiano and Sheth, Ravi K.}, biburl = {https://www.bibsonomy.org/bibtex/20aba85560a5a26157faf5ba66edd925b/citekhatri}, description = {The statistics of primordial black holes in a radiation dominated Universe -- a review and new results}, interhash = {fe523228abf06f4d5780c0de17b68af1}, intrahash = {0aba85560a5a26157faf5ba66edd925b}, keywords = {tifr}, note = {cite arxiv:2308.02971Comment: 18 pages; 7 figures}, timestamp = {2023-08-08T04:20:29.000+0200}, title = {The statistics of primordial black holes in a radiation dominated Universe -- a review and new results}, url = {http://arxiv.org/abs/2308.02971}, year = 2023 }