https://arxiv.org/abs/hep-th/0102143
ARXIV.ORG
Two Open Universes Connected by a Wormhole: Exact Solutions In this paper I present a spacetime of two open universes connected by a Lorentzian wormhole. The spacetime has the following features: (1) It can exactly solve the Einstein equations; (2) The weak energy condition is satisfied everywhere; (3) It has a topology of R^2times T_g (gge 2); (4) It has no event horizons.
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