devrimci_kürt Posted November 10, 2009 Share Posted November 10, 2009 Where does Hawking's calculation fail? Link to comment Share on other sites More sharing options...
DrP Posted November 10, 2009 Share Posted November 10, 2009 What is the temperature at the centre of a black hole? What is the net mass of the material at a point in the centre per mm^3? Link to comment Share on other sites More sharing options...
ajb Posted November 10, 2009 Share Posted November 10, 2009 Where does Hawking's calculation fail? Calculation of what? The Hawking temperature? Hawking's result was originally based on semiclassical gravity. It has been reproduced using string theory and loop quantum gravity. One criticism could be that the details may depend on a full quantum theory of gravity. But as all attempts in different frameworks seem to converge it looks like the Hawking temperature is a fundamental part of quantum gravity. Or are you referring to Penrose-Hawking's theorems on gravitational collapse? The showed, under some reasonable assumptions (energy conditions and no CTC's etc) that in classical general relativity gravitational collapse always leads to a singularity. The exact conditions for an even horizon to form are not completely clear. Like any theorem, they are only as strong as the conditions enforced. Or are you questioning some other calculation of Hawking? Link to comment Share on other sites More sharing options...
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