Large N wormhole approach to spacetime foam

Abstract

A simple model of spacetime foam, made by $N$ wormholes in a semiclassical approximation, is taken under examination. We show that the qualitative behaviour of the fluctuation of the metric conjectured by Wheeler is here reproduced.Comment: Revtex 3.0, 12 pages, accepted in Phys. Lett. B, Acknowledgements include