PRIMORDIAL BLACK HOLE FORMATION IN THE MATTER-DOMINATED PHASE OF THE UNIVERSE
By T. Harada, Chul-Moon Yoo, K. Kohri, K. Nakao, S. Jhingan. 2016
144 citations recorded by the source corpus.
We investigate primordial black hole formation in the matter-dominated phase of the universe, where nonspherical effects in gravitational collapse play a crucial role. This is in contrast to the black hole formation in a radiation-dominated era. We apply the Zel’dovich approximation, Thorne’s hoop conjecture, and Doroshkevich’s probability distribution and subsequently derive the production probability of primordial black holes. The numerical result obtained is applicable even if the density fluctuation σ at horizon entry is of the order of unity. For , we find a semi-analytic formula , which is comparable to the Khlopov–Polnarev formula. We find that the production probability in the matter-dominated era is much larger than that in the radiation-dominated era for , while they are comparable with each other for . We also discuss how σ can be written in terms of primordial curvature perturbations.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/c1f7510ac5e4f09c222de34d5cf3a9a8337c8552
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In Astronomy and Astrophysics
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- Juan García-Bellido
- Jeremiah P. Ostriker
In Nuclear and High Energy Physics
Citations in the corpus
- Primordial Black Holes as Dark Matter: Recent Developments (2020, unknown): “[82] and leads to a mass function”
- Primordial black holes as generators of cosmic structures (2018, result): “(3.6) This is in agreement with the recent analysis of Harada et al (2016) and leads to a mass function dn dm ∝ m−2δH(m)5 .”
- Primordial black holes from α-attractors (2018, background): “[83] examined the PBH production in a matter dominated universe and found that it is generally larger, though non-spherical effects are present and decrease the efficiency of the collapse in a pressureless background.”