Primordial black holes (PBHs) may readily form during the radiation dominated stages of the universe from the gravitational collapse of horizon-size energy density fluctuations of moderate amplitude. PBH formation is particularly efficient during a cosmic QCD transition, due to a generic decrease in ...
The masses of primordial black holes that survive to the current day is likely to be larger than 1015 g. Such a black hole would have a Schwarzschild radius of 10−15 m so it would be about the size of a proton. To investigate the detectability of such objects it is interesting to ...
Motivated by the increasing interest in teleparallel gravity, we study the production of the primordial black hole, the constraints of the amplitude of the scalar primordial on the parameters of the model. The gravitational waves are also considered in this context. To this aim, we introduce the ...
As Hawking had first realized, black holes evaporate over time, via Hawking radiation. But what about PBHs larger than 1011 kg (about the size of a small asteroid) that had not totally evaporated? Might they provide a neat explanation for part or all of the missing dark matter needed to ...
Download: Download full-size image Fig. 2. PBH DM parameter space as a function of bare PBH mass, depicting dressed and bare PBHs. Projections at 95% confidence level for dressed (“w/ halo”) as well as bare (“w/o halo”) PBHs considering 5 × 104 upcoming FRB observations are...
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However, we do have two very interesting limits on the formation of the first black holes. The first comes from observations of the most distant known black holes: light is emitted by material falling into the deep gravitational potential of the black hole. These monsters are so bright that ...
What is a primordial black hole? Science Springs Origins of the Primordial Black Hole Stephen Hawking first mentioned primordial black holes (PBHs) in the 1970s as he developed his ideas for cosmology, findings that were a potential consequence of the radiation-dominated universe, a brief period...
Full size image In Fig.1we plot the various lines of constraints and the region of diffusive and non-diffusive gravitational capture on the\(x-y\)plane, on logarithmic scales for bothxandy(see figure caption for details). The range ofxunder consideration is\(10^{-20}\lesssim x\lesssim 10...
Full size image Stochastic inflation is an effective theory approach to studying the long-wavelength components of the inflationary quantum fluctuations. It involves coarse-graining these fluctuations over a fixed scale, just larger than the Hubble radius during the period of inflation. The fixed scale...