  We obtain a large class of smooth Lorentzian p-brane wormholes in
supergravities in various dimensions. They connect two asymptotically flat
spacetimes. In cases where there is no dilaton involved in the solution, the
wormhole can connect an AdS_n\times S^m in one asymptotic region to a flat
spacetime in the other. We obtain explicit examples for (n,m)=(4,7), (7,4),
(5,5), (3,3), (3,2). These geometries correspond to field theories with UV
conformal fixed points, and they undergo decompactification in the IR region.
In the case of AdS_3, we compute the central charge of the corresponding
conformal field theory.
