The ineludible non-Gaussianity of the primordial black hole abundance

0522516 - FZÚ 2020 RIV GB eng J - Článek v odborném periodiku
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
Grant CEP: GA MŠMT EF15_003/0000437
Grant ostatní: OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institucionální podpora: RVO:68378271
Klíčová slova: physics of the early universe * primordial black holes
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.210, rok: 2019
Způsob publikování: Omezený přístup
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.
Trvalý link: http://hdl.handle.net/11104/0306996