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- Primordial black holes as a dark matter candidate - a brief overview
We will focus on the most popular, and arguably minimal, PBH formation mechanism, namely the collapse of large den-sity perturbations during radiation domination (Zel’dovich and Novikov, 1967; Hawking, 1971; Carr and Hawking, 1974)
- Anne Green University of Nottingham - Max Planck Society
•To form an interesting density of PBHs from collapse of density perturbations, need density perturbations on small scales to be substantially larger than on cosmological scales
- Green-PBHs - indico. cern. ch
Reduction in the equation of state parameter (w=p ρ) at phase transitions decreases the threshold for PBH formation δc and enhance the abundance of PBHs formed on this scale
- A Brief Review on Primordial Black Holes as Dark Matter
Primordial black holes (PBHs) represent a natural candidate for one of the components of the dark matter (DM) in the Universe In this review, we shall discuss the basics of their formation, abundance and signatures
- Exploring Primordial Black Holes as Probes for Early Cosmological History
In a radiation-dominated (RD) era, radiation pressure prevents the collapse of density fluctuations at sub-horizon scales As a result, only fluctuations whose physical size is on the scale of the cosmic horizon could collapse under their own gravity (if their amplitude is large enough)
- NANOGrav Data Hints at Primordial Black Holes as Dark Matter
During the radiation-dominated phase, an overdense region collapses to form a PBH at horizon reentry if the volume-averaged density contrast is larger than a critical value δc, which has been found with dedicated relativistic numerical simulations in Refs [9 –11]
- Primordial black holes - arXiv. org
The problem of estimating the mass and abundance of these PBH is framed in terms of the statistics of the fluctuations describing density inhomogeneities in Fourier space during radiation domination
- Green-PBHs-berkeley-nobackup
Relationship between density perturbations and curvature perturbations is non-linear, so even if curvature perturbations are gaussian (large) density perturbations
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