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• W2965133742 abstract "In this letter, we argue and show numerically that the threshold to form primordial black holes from an initial spherically symmetric perturbation is, to an excellent approximation, universal, whenever given in terms of the compaction function averaged over a sphere of radius $r_m$, where $r_m$ is the scale on which the compaction function is maximum. This can be understood as the requirement that, for a black hole to form, each shell of the averaged compaction function should have an amplitude exceeding the so-called Harada-Yoo-Kohri limit. For a radiation dominated universe we argued, supported by the numerical simulations, that this limit is $delta_c = 0.40$, which is slightly below the one quoted in the literature. Additionally, we show that the profile dependence of the threshold for the compaction function is only sensitive to its curvature at the maximum. We use these results to provide an analytic formula for the threshold amplitude of the compaction function at its maximum in terms of the normalised compaction function curvature at $r_m$." @default.
• W2965133742 created "2019-08-13" @default.
• W2965133742 creator A5003646453 @default.
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• W2965133742 creator A5070117166 @default.
• W2965133742 date "2020-02-13" @default.
• W2965133742 modified "2023-10-14" @default.
• W2965133742 title "Universal threshold for primordial black hole formation" @default.
• W2965133742 cites W1974098534 @default.
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• W2965133742 doi "https://doi.org/10.1103/physrevd.101.044022" @default.
• W2965133742 hasPublicationYear "2020" @default.
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