Entanglement entropy in two dimensional string theory

Understand

To understand an emergent spacetime is to understand the emergence of locality.

• Entanglement entropy is a powerful diagnostic of locality, because locality leads to a large amount of short distance entanglement.
• Two dimensional string theory is among the very simplest instances of an emergent spatial dimension.
• We compute the entanglement entropy in the large $N$ matrix quantum mechanics dual to two dimensional string theory, in the semiclassical limit of weak string coupling.