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 ...
If there are enough primordial black holes around to account for "dark matter" I have already posted in another thread how many would be in a given volume, and what that means for how many would be in our solar system, planet, even our individual bodies, depending on the size/mass postu...
These enclosed walls can collapse in on themselves, compressing a large amount of energy into a small volume and potentially forming primordial black holes (PBHs). We study the number density and dynamics of these self-enclosed walls, taking into account their size distribution, Hubble expansion, ...
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 theywouldn’tsolve would be dark energy, the mysterious force that is accelerating the expansion of the Universe. Some postulated that the PBH’s Hawking radiation (a huge consequence and success of quantum mechanics with black holes) could lead to such an effect as the black hole slowly...
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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 ...
摘要原文 During slow-roll inflation, non-perturbative transitions can produce bubbles of metastable vacuum. These bubbles expand exponentially during inflation to super-horizon size, and later collapse into black holes when the expansion of the universe is decelerating. In a broad class of models, th...
The theory that dark matter could be made of primordial black holes a fraction of a millimeter in size has been ruled out by a team of researchers led by the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU). ...
After a significant collision with another celestial body, the primordial black hole could be ejected, leaving behind the hollow body. These “emptied” celestial objects could then be identified by their anomalously low mass. “If the object’s density is too low for its size, that’s a good...