[Cos-top] recent cosmic topology work

[Marcelo J. Reboucas]

Dear Boud,

Thank you very much for calling my attention for the references.

Best wishes,
Marcelo.

On Tue, Apr 7, 2009 at 8:19 AM, Boud Roukema <boud at astro.uni.torun.pl>wrote:

> hi everyone on cos-top,
>
> The Ulm group continue to work on T^3 models - here's a nice new
> paper:
>
> http://arXiv.org/abs/0903.3133 <http://arxiv.org/abs/0903.3133>
>
>
> Other news: there's an observational signature of cosmic topology
> which occurs for flat compact models but not for curved compact models
> (assuming standard physical components of the Universe in both cases).
>
> The good news for cosmic topology in general: this observational
> signature has been detected to extremely high significance!  :)
>
> The bad news for the Poincare space: this observational signature has
> been detected to extremely high significance!  :(
>
> Details: http://arxiv.org/abs/0904.0975
>
> A Poincare space is certainly not excluded by the argument, but it
> would require an exotic explanation for the observational signature
> rather than a simple explanation. Occam's razor suggests that we may
> have to accept T^3 (or another flat compact space).
>
> Anyway, see the paper to find out what this observational signature
> is.
>
> cheers
> boud
>
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