Re: universe expanding, not from any particular spot

[Jack Uretsky <jlu@HEP.ANL.GOV>]

Ahh!  One small correction:

On Sun, 13 Aug 2000, John Denker wrote:


>  We do not know, and do not care, whether our universe is
> embedded in a higher-dimensional space.

        A lot of people care a whole bunch.
        In the Randall-Sundrum model, there may be extra large-dimensions
in which gravity, but nothing else, acts.  Gravity at short distance is
modified; the scale of the modification varies inversely as the number of
extra dimensions.  Two extra dimensions would be detectable at distances
of the order of a millimeter.  Experiments are in progress at the U. of
Washington, and probably elsewhere.
                                        Regards,
                                                Jack