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Article #955

Re: An easy problem in general relativity

#955
From: Mcinnes B T (Dr)
Date: Mon, 10 Aug 1992 06:05
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Of all these replies I like those of Joe Voros and John Baez the best.
But I can put all your perplexities to rest.
I f you want to find out how much matter [you know, matter: this stuff
here, not that interesting but irrelevant [here] parameter with which
Schoen and Yau concerned themselves] there is in a region, you just
integrate the appropriate component of the stress-energy tensor over the
appropriate spacelike hypersurface. In the Schwarzschild case, the
answer is zero.
I think that people are reluctant to accept this because they want to
hang on to the mistaken notion that "gravity" is "caused" by matter.
A glance at the Kruskal diagram ought to cure this, even if people do
believe that there really is matter there, "in" the singularity.
JB: I would not bet any money on cosmic censorship if I were you. There
was never any reason to believe it, and nowadays there is even less.
To conclude: there is nothing bad about singularities in GR, and this is
not a good reason to pursue quantum gravity. Furthermore I predict that
if quantum gravity ever materialises [so to speak], it will not make the
singularities go away. Regrettably it seems unlikely that any of us will
live long enough for that prediction to be tested.
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Message-ID: <1992Aug10.060505.18204@nuscc.nus.sg>
Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!jvnc.net!nuscc!matmcinn
References: <1992Aug10.121958.89713@physics.monash.edu.au>

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From: matmcinn@nuscc.nus.sg (Mcinnes B T (Dr))
Subject: Re: An easy problem in general relativity
Message-ID: <1992Aug10.060505.18204@nuscc.nus.sg>
Organization: National University of Singapore
References: <1992Aug10.121958.89713@physics.monash.edu.au>
Date: Mon, 10 Aug 1992 06:05:05 GMT
Lines: 19