Re: Hawking says he's solved black-hole riddle

From: Ian Bannister (ian.bannister_at_freeuk.com)
Date: 07/23/04 

Date: Fri, 23 Jul 2004 22:05:25 +0100

In message <2p%Lc.15952$Zr.4619@okepread01>
          "cherring17" <cherring17@home.com> wrote:

> I never believed this either. Nature always seems to resolve infinities. The
> core of a black hole probably contains some new form of very dense matter
> unknown to us but real matter none the less. At some point in time, after
> losing enough energy, black holes probably explode due to internal pressures
> finally again overcoming gravity. This is not a good scenario for us but it
> is probably what happens in time.

 There is no room in GR for black holes without singularities. Once inside
the idea of force becomes irrelevant. Space is completely directional towards
the centre so everything must end up there.
 The problem of singularities is more complex and stranger than this. When
the black hole explodes there is no reason why the singularity cannot still
exist. Singularities inside a black hole are required to draw everything into
them that enters the hole (according to GR). This means that if you could
survive going in you would never know whether they were made of different
matter or not. Exposed or 'naked' singularites are quite different and may
not have any gravitational attraction of their own at all. You would be able
to 'see' them and their effects. Perhaps something would make such things
impossible but there is no definate answer to this. 

-- 
Ian Bannister

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