The Hawking evaporation process of rapidly-rotating black holes: An almost continuous cascade of gravitons

It is shown that rapidly-rotating Kerr black holes are characterized by the dimensionless ratio ${\tau }_{\text{gap}}\mathrm{/}{\tau }_{\text{emission}}=O(1)$, where ${\tau }_{\text{gap}}$ is the average time gap between the emission of successive Hawking quanta and ${\tau }_{\text{emission}}$ is the characteristic timescale required for an individual Hawking quantum to be emitted from the black hole. This relation implies that the Hawking cascade from rapidly-rotating black holes has an almost continuous character. Our results correct some inaccurate claims that recently appeared in the literature regarding the nature of the Hawking black-hole evaporation process.