Quantum backreaction on chronology horizons

Quantum backreaction on chronology horizons

Blog Article

Abstract We extend in two directions our recent investigation of strongly interacting quantum fields in a class of spacetimes with chronology horizons (Misner spacetimes).First, we generalize to arbitrary dimensions the holographic mechanism of chronology protection in the absence of gravitational backreaction.The AdS geometry dual to a conformal field theory in these Patch spacetimes shows, in every dimension, an entire separation between the bulk duals of the chronal and non-chronal regions, with the former being complete, regular geometries.

In some instances the protection requires the inclusion of non-planar CFT corrections, which we obtain using double holography.Second, we compute the gravitational backreaction of the quantum Stick Blender fields in the Misner-AdS3 spacetime, and show that the null chronology horizon turns into a strong, spacelike curvature singularity.This is one of the few controlled, explicit examples where we can see quantum effects change a Cauchy horizon into a spacelike singularity.