The ineludible non-Gaussianity of the primordial black hole abundance

0522516 - FZÚ 2020 RIV GB eng J - Journal Article
De Luca, V. - Franciolini, G. - Kehagias, A. - Peloso, M. - Riotto, A. - Unal, Caner
The ineludible non-Gaussianity of the primordial black hole abundance.
Journal of Cosmology and Astroparticle Physics. Roč. 2019, č. 7 (2019), s. 1-28, č. článku 048. ISSN 1475-7516. E-ISSN 1475-7516
R&D Projects: GA MŠMT EF15_003/0000437
Grant - others:OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institutional support: RVO:68378271
Keywords : physics of the early universe * primordial black holes
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.210, year: 2019
Method of publishing: Limited access
https://doi.org/10.1088/1475-7516/2019/07/048

We study the formation of primordial black holes when they are generated by the collapse of large overdensities in the early universe. Since the density contrast is related to the comoving curvature perturbation by a nonlinear relation, the overdensity statistics is unavoidably non-Gaussian. We show that the abundance of primordial black holes at formation may not be captured by a perturbative approach which retains the first few cumulants of the non-Gaussian probability distribution. We provide two techniques to calculate the non-Gaussian abundance of primordial black holes at formation, one based on peak theory and the other on threshold statistics. Our results show that the unavoidable non-Gaussian nature of the inhomogeneities in the energy density makes it harder to generate PBHs.
Permanent Link: http://hdl.handle.net/11104/0306996