The role of non-gaussianities in primordial black hole formation

Publication date: Available online 31 January 2019Source: Physics of the Dark UniverseAuthor(s): Vicente Atal, Cristiano GermaniAbstractWe re-analyse current single-field inflationary models related to primordial black holes formation. We do so by taking into account recent developments on the estimations of their abundances and the influence of non-gaussianities. We show that, for all of them, the gaussian approximation, which is typically used to estimate the primordial black holes abundances, fails. However, in the case in which the inflaton potential has an inflection point, the contribution of non-gaussianities is only perturbative. Finally, we infer that only models featuring an inflection point in the inflationary potential, might predict, with a very good approximation, the desired abundances by the sole use of the gaussian statistics.

Source: Physics of the Dark Universe - January 31, 2019 Category: Physics Source Type: research