Cosmological evolution of a ghost scalar field

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 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.

8 pages

References in corpus (5)

• On a class of stable, traversable Lorentzian wormholes in classical general relativity
• De Sitter Space in Supergravity and M Theory
• The Tensor to Scalar Ratio of Phantom Dark Energy Models
• Assisted Contraction
• Dilatonic wormholes: construction, operation, maintenance and collapse to black holes

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