Re: poly: accelerating universe and Leslie constraints

From: Nick Bostrom <>
Date: Sat Mar 27 1999 - 07:05:07 PST

Damien Broderick wrote:

> Some time ago we had a discussion on the Doomsday arguments advanced by
> John Leslie and others. This spills over into anthropic cosmology, the
> Great Filter, etc. The Guardian published an account recently of a paper
> (posted on the Net) by Lawrence Krauss and Glenn Starkman, both of Case
> Western Reserve U., that the newly discovered acceleration of the
> observable universe implies a light-cone horizon that will isolate our
> local cluster some 100 billion years from now. The farthest galaxies will
> start to be carried away faster than light some 15 billion years hence.
> I wonder what impact this has on the Leslie argument?

None so far as I can see. If the new discoveries have a bearing on
whether the universe (i.e. muliverse - the totality of everything
that exists) is infinite or not, then they might be relevant however.
At least the Doomsday argument is very problematic in the infinite
case and might not work at all.

Nick Bostrom
Department of Philosophy, Logic and Scientific Method
London School of Economics
Received on Sat Mar 27 07:06:57 1999

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