A possible quantum limit for the stabilization of moduli in brane-world scenarios

I consider the implications for brane-world scenarios of the rather robust quantum-gravity expectation that there should be a quantum minimum limit on the uncertainty of all physical length scales. In order to illustrate the possible significance of this issue, I observe that, according to a plausible estimate, the quantum limit on the length scales that characterize the bulk geometry could affect severely the phenomenology of a recently-proposed brane world scenario. (C) 2000 Elsevier Science B.V. All rights reserved.