Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: jeffreyH on 18/03/2014 23:51:47

Title: Lower mass limit for black holes
Post by: jeffreyH on 18/03/2014 23:51:47
From wikipedia

"High-energy collisions

A simulated event in the CMS detector, a collision in which a micro black hole may be created.
Gravitational collapse is not the only process that could create black holes. In principle, black holes could be formed in high-energy collisions that achieve sufficient density. As of 2002, no such events have been detected, either directly or indirectly as a deficiency of the mass balance in particle accelerator experiments.[77] This suggests that there must be a lower limit for the mass of black holes. Theoretically, this boundary is expected to lie around the Planck mass (mP = √ħc/G ≈ 1.21019 GeV/c2 ≈ 2.210−8 kg), where quantum effects are expected to invalidate the predictions of general relativity.[78] This would put the creation of black holes firmly out of reach of any high-energy process occurring on or near the Earth. However, certain developments in quantum gravity suggest that the Planck mass could be much lower: some braneworld scenarios for example put the boundary as low as 1 TeV/c2.[79] This would make it conceivable for micro black holes to be created in the high-energy collisions occurring when cosmic rays hit the Earth's atmosphere, or possibly in the new Large Hadron Collider at CERN. Yet these theories are very speculative, and the creation of black holes in these processes is deemed unlikely by many specialists.[80] Even if micro black holes should be formed in these collisions, it is expected that they would evaporate in about 10−25 seconds, posing no threat to the Earth.[81]"

I am looking into this. I am starting with the Chandrasenkhar mass limit. I would appreciate input on this. Any thoughts whatsoever would be useful.