Cosmological bounces and Lorentzian wormholes in Galileon theories with an extra scalar field

Abstract

We study whether it is possible to design a "classical" spatially flat bouncing cosmology or a static, spherically symmetric asymptotically flat Lorentzian wormhole in cubic Galileon theories interacting with an extra scalar field. We show that bouncing models are always plagued with gradient instabilities, while there are always ghosts in wormhole backgrounds.

arXiv comment12 pages. Journal version, minor corrections

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