Non-Gaussian Formation of Primordial Black Holes: Effects on the Threshold
Jun 17, 2019
Citations per year
Abstract: (IOP)
Primordial black holes could have been formed in the early universe from sufficiently large cosmological perturbations re-entering the horizon when the Universe is still radiation dominated. These originate from the spectrum of curvature perturbations generated during inflation at small-scales. Because of the non-linear relation between the curvature perturbation and the overdensity , the formation of the primordial black holes is affected by intrinsic non-Gaussianity even if the curvature perturbation is Gaussian. We investigate the impact of this non-Gaussianity on the critical threshold which measures the excess of mass of the perturbation, finding a relative change with respect to the value obtained using a linear relation between and , of a few percent suggesting that the value of the critical threshold is rather robust against non-linearities. The same holds also when local primordial non-Gaussianity, with , are added to the curvature perturbation.Note:
- 24 pages, 6 figures. This last updated version contains minor fine-tunings according to the published one
- curvature: perturbation
- black hole: primordial
- non-Gaussianity
- formation
- mass: perturbation
- black hole: formation
- inflation
- effect: nonlinear
- horizon
References(38)
Figures(15)
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- [5]
- [6]
- [7]
- [8]
- [9]
- [10]
- [11]
- [12]
- [13]
- [14]
- [15]
- [16]
- [17]
- [18]
- [19]
- [20]
- [21]
- [22]
- [23]
- [24]
- [25]