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From: phys-l@lists.nau.edu: Forum for Physics Educators
[mailto:PHYS-L@lists.nau.edu]On Behalf Of Jack Uretsky
Sent: Sunday, August 13, 2000 8:02 PM
To: PHYS-L@lists.nau.edu
Subject: Re: universe expanding, not from any particular spot
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