We discuss the structure of a gravitational Euclidean instanton obtained through coupling of gravity to electromagnetism. This Euclidean solution can be interpreted as a tunneling to a hyperbolic space (baby universe) or alternatively as a static wormhole that joins two asymptotically flat spaces of a Reissner-Nordström type solution.
M. Cavaglia et al., "Anisotropic Wormhole: Tunneling in Time and Space," Physical Review D, vol. 49, no. 12, pp. 6493-6499, American Physical Society (APS), Jun 1994.
The definitive version is available at https://doi.org/10.1103/PhysRevD.49.6493
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