Re: An Experiment

Posted by phobos on April 06, 19101 at 10:28:59:

In Reply to: Re: An Experiment posted by jsodemann on April 05, 19101 at 17:51:06:

In these millimeter dimension scenarios, the high energy is due to the fact that standard model forces are confined in the extra dimensions and only gravity propagates therein. The smallness results from the gravitational coupling in conjunction with the dimension size. For n extra dimensions of size R, our gravity scale M is related to the Planck scale M' by

M'^2=R^n M^(2+n)

(I'm stealing this from Dimopolous, Dvali, Arkani-Hamed), where one takes M~1 TeV. Stronger forces than gravity (with larger couplings) would probe these dimensions at lower energies, but their scenario forbids this. In most string theory cases, it seems rather unnatural to have dimensions much larger than the Planck length.

phobos

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