Multi-mouth traversable wormholes

A bstract We describe the construction of traversable wormholes with multiple mouths in four spacetime dimensions and discuss associated quantum entanglement. Our may be traversed between any pair mouths. In particular, three-mouth case they have fundamental group F 2 (the free on two generators). By contrast, connecting three regions A, B, C pairs ( AB , BC AC ) using separate would give 3 . solutions are asymptotically flat up to presence possible magnetic fluxes or cosmic strings that extend infinity. The begins a two-mouth wormhole supported by backreaction from fields. Inserting sufficiently small black hole into its throat preserves traversability original This is taken mouth another new distant region spacetime. Making manner similar provides desired causal connections. From dual field theory point view, when AdS asymptotics added our construction, multiparty entanglement play an important role resulting wormhole.