Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 3660
Articles: 2'599'751
Articles rated: 2609

10 November 2024
 
  » arxiv » 2206.01150

 Article overview



Primordial black hole formation in $F(R)$ bouncing cosmology
Shreya Banerjee ; Theodoros Papanikolaou ; Emmanuel N. Saridakis ;
Date 2 Jun 2022
AbstractThe phenomenology of primordial black holes (PBHs) physics, and the associated PBH abundance constraints, can be used in order to probe the early-universe evolution. In this work, we focus on the bounce realization within $F(R)$ modified gravity and we investigate the corresponding PBH behavior. In particular, we calculate the energy density power spectrum at horizon crossing time as a function of the involved theoretical parameters, and then we extract the PBH abundance in the context of peak theory, considering the non-linear relation between the density contrast and the comoving curvature perturbation, as well as the critical collapse law for the PBH masses. We first calculate the PBH mass function, and then we extract the PBH abundance $Omega_mathrm{PBH,f}$ at formation time as a function of the model parameters, namely the involved $F(R)$ parameter $alpha$ and the Hubble parameter at the transition time from the bounce to the radiation dominated epoch $H_mathrm{RD}$. Interestingly, we find that in order to have a significant black hole production, namely $10^{-10}<Omega_mathrm{PBH,f}<1$, $H_mathrm{RD}$ and $alpha$ should lie roughly within the ranges $10^{-7}M_mathrm{Pl}leq H_mathrm{RD}leq 10^{-6}M_mathrm{Pl}$, $10^{-9}M_mathrm{Pl}leq H_mathrm{RD}leq 2 imes 10^{-9}M_mathrm{Pl}$ and $10^{-30}M^2_mathrm{Pl}leq alpha leq 10^{-12}M^2_mathrm{Pl}$ respectively. Finally, we show that the excluded region corresponding to PBH overproduction forms a closed ring.
Source arXiv, 2206.01150
Services Forum | Review | PDF | Favorites   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.






ScienXe.org
» my Online CV
» Free

home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2024 - Scimetrica