R. Balbinot et al., FRIEDMANN UNIVERSES CONNECTED BY REISSNER-NORDSTROM WORMHOLES, Physical review. D. Particles and fields, 49(6), 1994, pp. 2801-2807
We study a wormhole consisting of closed Friedmann-like regions connec
ted by Reissner-Nordstrom black holes. We construct the wormhole using
Israel's junction conditions, and investigate its stability and trave
rsibility.