My two papers on primordial regular BHs with Marco Calzà and Davide Pedrotti (see these two earlier news items: part 1 and part 2), where we characterize non-singular primordial BHs as DM candidates, have now officially been published in PRD! The full bibliographic coordinates for the papers are Phys. Rev. D 111 (2025) 024009 and Phys. Rev. D 111 (2025) 042010. Here and here are the links to the papers.
Primordial regular black holes papers accepted in PRD!
Extremely good news today as my two earlier papers on primordial regular BHs with Marco Calzà and Davide Pedrotti (see these two earlier news items: part 1 and part 2), where we characterize non-singular primordial BHs as DM candidates, have both been accepted for publication in PRD! There have been a few changes with respect to the earlier versions (slight changes to the titles, discussions on the time evolution of these BHs added, and a few minor additions), but our main messages are unaltered. You can read the preprint versions of the papers on arXiv: 2409.02804 and 2409.02807.
Primordial regular black holes (part 2)
A truly busy day today, as with Marco Calzà and Davide Pedrotti we posted not one but two papers! In our first paper, covered in this other news item and motivated by the fact that all studies on primordial black holes (PBHs) consider Schwarzschild and Kerr BHs which feature curvature singularities, we took a first step towards studying primordial regular BHs as dark matter (DM) candidates, focusing on phenomenological tr-symmetric metrics. In this paper, we extend our pilot study to non-tr-symmetric metrics, which complicate our work by a fair margin. Aside from the well-known Simpson-Visser metric, the space-times we studied include two metrics inspired by Loop Quantum Gravity, more specifically the Peltola-Kunstatter and D’Ambrosio-Rovelli ones, and in all three cases we find that the “asteroid mass window” where all the DM can be made of PBHs is enlarged. You can read our results in the preprint we just posted on arXiv: 2409.02807.
Primordial regular black holes (part 1)
I would be lying if I didn’t say I am particularly proud of this new paper which appeared today with Marco Calzà and Davide Pedrotti, making it another made in Trentino paper and, especially, another paper entirely produced within my group (note that this paper is for 2/3 made within the Valle dei Laghi, which is where both Marco and Davide originally come from)! There are a huge number of studies on primordial black holes (PBHs) as potential dark matter (DM) candidates, yet virtually (almost) all of these works consider Schwarzschild or Kerr BHs, which suffer from a few well-known problems, including the presence of curvature singularities. In today’s paper we therefore took a first step towards characterizing primordial regular BHs (which, on the contrary, do not feature curvature singularities) as DM candidates, finding that they can potentially lead to a larger “asteroid mass window” where PBHs can make up all the DM. Today’s pilot study is focused on so-called tr-symmetric metrics, which include the well-known Bardeen and Hayward regular BHs, whereas we have also put out a companion paper (covered in this other news item), where we study non-tr-symmetric metrics, which also include metrics inspired from Loop Quantum Gravity. You can read our results in the preprint we just posted on arXiv: 2409.02804.
