Time machines and traversable wormholes in modified theories of gravity

Time machines and traversable wormholes in modified theories of gravity

Blog Article

We review recent work on wormhole geometries in the context of modified theories of gravity, in particular, in Hemp Wicks f(R) gravity and with a nonminimal curvature-matter coupling, and in the recently proposed hybrid metric-Palatini theory.In principle, the normal matter threading the throat can be shown to satisfy the energy conditions and it is the higher order curvatures terms that sustain these wormhole geometries.We also briefly review the conversion of wormholes into time-machines, explore bongs several of the time travel paradoxes and possible remedies to these intriguing side-effects in wormhole physics.