Discovering the Discrete Universe

Understand

This paper presents an brief review of some recent work on the causal set approach to quantum gravity.

• Causal sets are a discretisation of spacetime that allow the symmetries of GR to be preserved in the continuum approximation.
• One proposed application of causal sets is to use them as the histories in a quantum sum-over-histories, i.e.
• to construct a quantum theory of spacetime.