Quote:
Originally Posted by sjastro
A BH can only generate heat through Hawking radiation.
The heat output is sensational. For a solar mass BH you will raise the temperature by one ten millionth of a degree above absolute zero. For larger BHs the increase in temperature is even less as a smaller percentage of mass is converted to Hawking radiation.
The temperature from matter falling into a BH is a very different picture. The temperature can be raised by hundreds of millions of degrees.
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So the temperature is inversely proportional to the mass, eh ? (Apart from the temperature of the falling matter, that is .. they must consider this to be a separate item of the overall temperature of the whole thing (??))
Really interesting (to me), is that as a BH emits Hawking Radiation, the mass drops, and hence the temperature increases and, as it approaches Planck mass, the temperature is about the same as the Big Bang 10∧32 degrees !! (I think we've spoken of this in the past).
Clearly, they've been thinking about the relationships between the origin of the BB, and the possible role BHs may have played in it, for a while.
Penrose seems to see BHs playing major roles in multiple ways, though.
Interesting.
Cheers