A Bound on the Gravitino Mass from Fat Gravity and Thin Cosmological Constant

I study the proposal made by R.Sundrum that the small cosmological constant may be natural if we give up pointlike gravitons and pointlike gravitational couplings at distances shorter than about 20 microns ("fat gravity"). I show model-independently that in order for this scenario to coexist with a supersymmetric extension of the standard model, the gravitino mass must be less than about (20 micron)^(-1) or 10^(-2) eV.

hep group

Last modified: Sun Apr 3 21:16:41 EDT 2005