Abstract
We consider a scalar field with a negative kinetic term minimally coupled to gravity. We obtain an exact non-static spherically symmetric solution which describes a wormhole in a cosmological setting. The wormhole is shown to connect two homogeneous spatially flat universes expanding with acceleration. Depending on the wormhole's mass parameter m the acceleration can be constant (the de Sitter case) or infinitely growing.
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Sushkov, S.V., Kim, SW. Cosmological Evolution of a Ghost Scalar Field. General Relativity and Gravitation 36, 1671–1678 (2004). https://doi.org/10.1023/B:GERG.0000032159.46106.63
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DOI: https://doi.org/10.1023/B:GERG.0000032159.46106.63