Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: syhprum on 15/10/2010 21:51:52

Title: Is there any evidence for low mass blackholes
Post by: syhprum on 15/10/2010 21:51:52

There has been much discussion about the behavior of low mass BH,s but have any ever been observed ?
The only ones observed have been either ones in the region of 20 solar masses that have resulted from the collapse of large stars or those of millions of solar masses in the centres of galaxies.
Is there any mechanisms by which relatively low mass BH,s could be created.

Title: Is there any evidence for low mass blackholes
Post by: Soul Surfer on 16/10/2010 00:32:24

There are no processes small enough or violent enough to create black holes smaller than the mass of the sun  such things could only have occurred at the very earliest stages of the expansion and to me seem unlikely because it would have required a great deal of turbulence

Title: Is there any evidence for low mass blackholes
Post by: LeeE on 16/10/2010 19:19:10

I think there may have been some speculation that microscopic quantities of matter could be sufficiently collapsed by gamma or x-ray lasers.

Sorry, can't remember the references though.

Title: Is there any evidence for low mass blackholes
Post by: Soul Surfer on 16/10/2010 23:12:00

A one gram black hole lasts for about 10e-25 seconds before evaporating.  This is many orders of magnitude less time than it takes light to cross the nucleus of a hydrogen atom. 

By the way  the black hole was several orders of magnitude smaller than this so the light did get to travel a reasonable distance in comparison to the size of the hole before it finally died!