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Article 2285 of comp.ai.philosophy:
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>From: G.Joly@cs.ucl.ac.uk (Gordon Joly)
Newsgroups: comp.ai.philosophy
Subject: Black Hole Entropy.
Message-ID: <2199@ucl-cs.uucp>
Date: 19 Dec 91 18:09:25 GMT
Sender: news@cs.ucl.ac.uk
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>> Re: Searle's response to silicon brain? 
>> One might as well ask whether 
>> Einstein ever reacted to the counter-relativity experiment of sending 
>> Tom Swift's rocket backwards through a black-hole. 

I am glad you asked that. It was Stephen Hawking who proposed the
backwards (in time) tunneling of anti-particles (which implies a
forwards in time tunneling of the corresponding real particle) to give
his model of black hole evaporation.

For example, a anti-electron cames out travelling backwards in time
and then goes off as a an electron, in the normal time sense. Charge,
mass, etc are all conserved.

Not to mention entropy and the second law.

____

Gordon Joly                                       +44 71 387 7050 ext 3716
Internet: G.Joly@cs.ucl.ac.uk          UUCP: ...!{uunet,ukc}!ucl-cs!G.Joly
Computer Science, University College London, Gower Street, LONDON WC1E 6BT

          I didn't get where I am today by not recognising
               a cotangent bundle when I see one.


