Causal Sets: Quantum gravity from a fundamentally discrete spacetime

TL;DR

Causal Sets proposes a fundamentally discrete spacetime framework as a basis for quantum gravity, challenging the continuum assumption and exploring new kinematic and dynamic aspects.

Contribution

This paper reviews the causal set approach, highlighting recent advances in its kinematics and dynamics as a novel route to quantum gravity.

Findings

Discreteness of spacetime at fundamental level

Progress in understanding causal set kinematics

Development of causal set dynamics

Abstract

In order to construct a quantum theory of gravity, we may have to abandon certain assumptions we were making. In particular, the concept of spacetime as a continuum substratum is questioned. Causal Sets is an attempt to construct a quantum theory of gravity starting with a fundamentally discrete spacetime. In this contribution we review the whole approach, focusing on some recent developments in the kinematics and dynamics of the approach.