scholarly journals Cosmic microwave background bounds on primordial black holes including dark matter halo accretion

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Pasquale D. Serpico ◽  
Vivian Poulin ◽  
Derek Inman ◽  
Kazunori Kohri
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Cosmic Microwave Background ◽  
Dark Matter Halo ◽  
Primordial Black Holes ◽  
Microwave Background

scholarly journals Searching for dark matter constituents with many solar masses

2016 ◽  
Vol 31 (16) ◽  
pp. 1650093 ◽  
Author(s):  
Paul H. Frampton
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Cosmic Microwave Background ◽  
Massive Particle ◽  
Search Strategies ◽  
Observational Constraints ◽  
Primordial Black Holes ◽  
Microwave Background ◽  
Weak Scale ◽  
Weakly Interacting

Searches for dark matter (DM) constituents are presently mainly focused on axions and weakly interacting massive particle (WIMPs) despite the fact that far higher mass constituents are viable. We discuss and dispute whether axions exist and those arguments for WIMPs which arise from weak scale supersymmetry. We focus on the highest possible masses and argue that, since if they constitute all DM, they cannot be baryonic, they must uniquely be primordial black holes. Observational constraints require them to be of intermediate masses mostly between ten and a hundred thousand solar masses. Known search strategies for such PIMBHs include wide binaries, cosmic microwave background (CMB) distortion and, most promisingly, extended microlensing experiments.

scholarly journals Dark matter simulations with primordial black holes in the early Universe

2020 ◽  
Vol 499 (4) ◽  
pp. 4854-4862
Author(s):  
Maxim V Tkachev ◽  
Sergey V Pilipenko ◽  
Gustavo Yepes
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Dark Matter Halo ◽  
Future Research ◽  
Primordial Black Holes ◽  
Sizeable Fraction ◽  
Merger Rate ◽  
The Stability ◽  
The Universe ◽  
Good Agreement

ABSTRACT Primordial black holes (PBH) with masses of order $10\!-\!30 \, \mathrm{M}_\odot$ have been proposed as a possible explanation of the gravitational waves emission events recently discovered by the Laser Interferometer Gravitational-Wave Observatory (LIGO). If true, then PBHs would constitute a sizeable fraction of the dark matter component in the Universe. Using a series of cosmological N-body simulations that include both dark matter and a variable fraction of PBHs ranging from fPBH = 10−4 to fPBH = 1, we analyse the processes of formation and disruption of gravitationally bound PBH pairs, as well as the merging of both bound and unbound pairs, and estimate the probabilities of such events. We show that they are in good agreement with the constrains to the PBH abundance obtained by the LIGO and other research groups. We find that pair stability, while being a main factor responsible for the merger rate, is significantly affected by the effects of dark matter halo formation and clustering. As a side result, we also evaluate the effects of numerical errors in the stability of bound pairs, which can be useful for future research using this methodology.

scholarly journals Maximum PBH mass and primordiality

2018 ◽  
Vol 33 (31) ◽  
pp. 1850176
Author(s):  
Paul H. Frampton
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Cosmic Microwave Background ◽  
Observational Data ◽  
Supermassive Black Holes ◽  
Primordial Black Holes ◽  
Black Hole Mass ◽  
Microwave Background

In order to avoid unacceptable [Formula: see text]-distortions inconsistent with observational data on the Cosmic Microwave Background, Primordial Black Holes (PBHs) must be less massive than [Formula: see text], quite closely above the highest black hole mass yet observed. This comparableness leads us to posit that all supermassive black holes originate as PBHs.

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