Handling GR failure

**puppet_sock@hotmail.com** · #1 May 11th 04 posted to sci.physics.relativity

(Mitchell) wrote in message . com...
Stephen Hawking has said that General Relativity predicts its
own downfall by predicting singularities.

Other quantities go infinite at the event horizon. Namely the Einstein shift
and the metric components.

You don't seem to understand. There is nothing particular wrong,
nor stunning, about the nature of the horizon. The metric is not
singular there, only the coordinates most normally used. If you
express things in Kruskal or Penrose coords, nothing bad happens.
What is going on is, the light cone has moved around so that all
of it is pointing in, once you are past the horizon.

There is a singularity at the centre of a black hole. But that's
an entirely different kind of thing from the horizon. The centre
involves not just a coordinate problem, but a problem with the
metric and all invariants you can construct from it.

This causes me to say that the failure of the theory(GR) is at
the event horizon and that only a limited strength gravity theory
solves the problem correctly.
In this corrected, limited GR the maximum strength of gravity is
equivalent to the strength of gravity at the old event horizon.

So GR must be modified to become a finite gravity theory.

Feel free to construct an alternate gravity theory that does not
contain singularities. Go ahead and show that it reproduces the
observations we have. Until and unless you have such, you might
be wise to spend less time moaning about what things ought to
look like, and more time working on your theory.
Socks

**Bill Hobba** · #2 May 12th 04 posted to sci.physics.relativity

wrote in message
om...
(Mitchell) wrote in message
. com...
Stephen Hawking has said that General Relativity predicts its
own downfall by predicting singularities.

Other quantities go infinite at the event horizon. Namely the Einstein
shift
and the metric components.

You don't seem to understand. There is nothing particular wrong,
nor stunning, about the nature of the horizon. The metric is not
singular there, only the coordinates most normally used. If you
express things in Kruskal or Penrose coords, nothing bad happens.
What is going on is, the light cone has moved around so that all
of it is pointing in, once you are past the horizon.

This has been pointed out to him many times. I even gave him the references
is Wald where it is discussed in detail and its relation to the Rindler
metric. Mitchell does not really understand anything about GR, he simply
keeps posting pseudo scientific gibberish and expecting other to respond. I
am past caring about him. He has been given the proper references, all he
has to do now is make the effort.

Thanks
Bill

There is a singularity at the centre of a black hole. But that's
an entirely different kind of thing from the horizon. The centre
involves not just a coordinate problem, but a problem with the
metric and all invariants you can construct from it.

This causes me to say that the failure of the theory(GR) is at
the event horizon and that only a limited strength gravity theory
solves the problem correctly.
In this corrected, limited GR the maximum strength of gravity is
equivalent to the strength of gravity at the old event horizon.

So GR must be modified to become a finite gravity theory.

Feel free to construct an alternate gravity theory that does not
contain singularities. Go ahead and show that it reproduces the
observations we have. Until and unless you have such, you might
be wise to spend less time moaning about what things ought to
look like, and more time working on your theory.
Socks

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