Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2018/03/016
Keywords
cosmological perturbation theory; inflation; particle physics - cosmology connection; primordial black holes
Funding
- ASI/INAF [2014-024-R.0]
- Swiss National Science Foundation (SNSF), project Investigating the Nature of Dark Matter [200020-159223]
- Cosmology group at the Departement de Physique Theorique at the Universite de Geneve
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Primordial black holes may owe their origin to the small-scale enhancement of the comoving curvature perturbation generated during inflation. Their mass fraction at formation is markedly sensitive to possible non-Gaussianities in such large, but rare fluctuations. We discuss a path-integral formulation which provides the exact mass fraction of primordial black holes at formation in the presence of non-Gaussianity. Through a couple of classes of models, one based on single-field inflation and the other on spectator fields, we show that restricting to a Gaussian statistics may lead to severe inaccuracies in the estimate of the mass fraction as well as on the clustering properties of the primordial black holes.
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