Holography without strings?

Understand

A defining feature of holographic dualities is that, along with the bulk equations of motion, boundary correlators at any given time t determine those of observables deep in the bulk.

• We argue that this property emerges from the bulk gravitational Gauss law together with bulk quantum entanglement as embodied in the Reeh-Schlieder theorem.
• Stringy bulk degrees of freedom are not required and play little role even when they exist.
• As an example we study a toy model whose matter sector is a free scalar field.