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 1015g. Such a black hole would have aSchwarzschild radiusof 10−15m so it would be about the size of a proton. To investigate the detectability of such objects it is interesting to estimate...
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 ...
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...
So every known black hole weighs more than the entire solar system (sometimes much more). Related: Is our solar system's mysterious 'Planet 9' really a grapefruit-size black hole? Sign up for the Live Science daily newsletter now Get the world’s most fascinating discoveries delivered ...
black hole to probe the evolution and then compared the evolutionary features for the other polynomial form of the EoS. Inf(Q) modified gravity, primordial black holes are found to gain mass in the early epoch which finally attains a saturated mass. The picture is different from that of GR ...
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...
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 ...
Fast Radio Bursts and White Hole Signals We estimate the size of a primordial black hole exploding today via a white hole transition, and the power in the resulting explosion, using a simple model... A Barrau,C Rovelli,F Vidotto - 《Physical Review D》 被引量: 49发表: 2014年 The 1st ...
The mass of the smallest black hole known to exist at the centre of an active galaxy has been determined by an international team of astronomers, who argue that their result is “the best direct mass measurement for a galaxy of this size”. The researchers also say that their study could ...