Steps towards Lorentzian quantum gravity with causal sets

Understand

Causal set quantum gravity is a Lorentzian approach to quantum gravity, based on the causal structure of spacetime.

• It models each spacetime configuration as a discrete causal network of spacetime points.
• As such, key questions of the approach include whether and how a reconstruction of a sufficiently coarse-grained spacetime geometry is possible from a causal set.
• As an example for the recovery of spatial geometry from discrete causal structure, the construction of a spatial distance function for causal sets is reviewed.