Re: Inflation and the current accelerating expansion of the universe
From: Bjoern Feuerbacher (feuerbac_at_thphys.uni-heidelberg.de)
Date: 07/20/04
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Date: Tue, 20 Jul 2004 10:09:17 +0200
Big Mike wrote:
> Bjoern Feuerbacher <feuerbac@thphys.uni-heidelberg.de> wrote in message news:<cdg6pn$iqp$1@news.urz.uni-heidelberg.de>...
[snip]
>>Did you know that there are competing theories to inflation?
>><http://www.sciam.com/article.cfm?chanID=sa006&colID=1&articleID=00042F0D-1A0E-1085-94F483414B7F0000>
>
>
> Yes, I read that article. It was interesting to reread it in this
> context, thank you. In pre-big bang, prior to the big bang, was the
> universe accelerating to a big crunch?
Depends on the theory. For example, in the ekpyrotic model, there
was no big crunch, if I understand the model correctly.
> If so, what is it doing now?
It is accelerating. To what end, we don't know. The most basic model
says that it will be accelerating at about this rate for an infinite
time and slowly "die out". OTOH, the acceleration could also grow with
time, and a "Big Rip" could occur. It could also become slower with
time, reverse, and a "Big Crunch" could occur. Or the ekpyrotic model
is right, and there will a brane collision at someday in the future.
Etc.
Bye,
Bjoern
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