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• W3105800239 abstract "A common mechanism to form primordial black holes in the early universe is by enhancing at small-scales the scalar perturbations generated during inflation. If these fluctuations have a large enough amplitude, they may collapse into primordial black holes upon horizon re-entry. Such primordial black holes may comprise the totality of the dark matter. We offer some considerations about the formation and clustering of primordial black holes when the scalar perturbations are characterised by a broad spectrum. Using the excursion set method, as well as the supreme statistics, we show that the cloud-in-cloud phenomenon, for which small mass primordial black holes may be absorbed by bigger mass ones, is basically absent. This is due to the fact that the formation of a primordial black hole is an extremely rare event. We also show that, from the point of view of mass distribution, broad and narrow spectra give similar results in the sense that the mass distribution is tilted towards a single mass. Furthermore, we argue that primordial black holes from Gaussian broad spectra are not clustered at formation, their distribution is dominantly Poissonian." @default.
• W3105800239 created "2020-11-23" @default.
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• W3105800239 date "2019-11-04" @default.
• W3105800239 modified "2023-09-30" @default.
• W3105800239 title "Primordial black holes from broad spectra: abundance and clustering" @default.
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• W3105800239 doi "https://doi.org/10.1088/1475-7516/2019/11/001" @default.
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