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wolram
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can anyone tell me if "hawking radiation" has been observed?
or if there is evidence of its existence?
nasty stuff..
or if there is evidence of its existence?
nasty stuff..
Originally posted by wolram
can anyone tell me if "hawking radiation" has been observed?
or if there is evidence of its existence?
nasty stuff..
Originally posted by wolram
peter pan and tinkerbell, what man controles there strings?
Originally posted by marcus
small BH may have been produced in large numbers under the high-energy-density conditions of the early universe
but we DO NOT SEE multitudes of small BH holes, therefore where did they all go?
perhaps they evaporated
indeed, according to hawking's theory, small BH should be much hotter and evaporate more quickly than the sort of large BH which we see around and about
this then (the fact that we do not see them) it can be argued, is evidence that quite small BH are able to evaporate,
which they do by emitting the nasty hawking radiation
Originally posted by marcus
wolram, to my knowledge hawking radiation has never been observed
but I imagine that there may arguably be some indirect supportive evidence
of the following kind
small BH may have been produced in large numbers under the high-energy-density conditions of the early universe
but we DO NOT SEE multitudes of small BH holes, therefore
(wolram I am not responsible for this argument) where did
they all go?
perhaps they evaporated
indeed, according to hawking's theory, small BH should be much hotter and evaporate more quickly than the sort of large BH which we see around and about
this then (the fact that we do not see them) it can be argued, is evidence that quite small BH are able to evaporate,
which they do by emitting the nasty hawking radiation
Originally posted by marcus
...small BH...formed in substantial numbers AFTER inflation. There is no one prevailing scenario for inflation but typically the inflation era is supposed to have been extremely early and brief and to have been followed by "reheating" to roughly Planck temperature
Originally posted by marcus
...black holes of greater than Planck mass may have formed from highly energetic particles after reheating----these would of course not be "inflated away"----and would then, because of their small mass have evaporated very quickly.
Originally posted by jeff
The transition in practical models is not instantaneous, however, so the reheating temperature is substantially lower than the temperature prior to inflation. In fact, the largest values obtained are ~ 1015 GeV which is much lower than the Planck energy ~ 1019 and occur only for special choices of parameters.
Originally posted by marcus
So what are people talking about when they discuss small BH forming in considerable numbers in early universe?
Hawking radiation is a phenomenon predicted by physicist Stephen Hawking in 1974. It describes the emission of particles from a black hole due to quantum effects near its event horizon.
Hawking radiation has not been directly observed, but its existence has been inferred through mathematical calculations and indirect observations of black holes.
Hawking radiation has important implications for our understanding of black holes and the laws of thermodynamics. It suggests that black holes are not completely black, but emit radiation and eventually evaporate over time.
Currently, there is no way to measure Hawking radiation directly. However, scientists are working on developing new technologies and techniques that may one day allow us to observe this phenomenon.
Hawking radiation is not directly relevant to everyday life, but its discovery has greatly advanced our understanding of the universe and the fundamental laws of physics. It also has potential applications in the fields of quantum mechanics and thermodynamics.