Quantum gravity: a quantum-first approach

Understand

A "quantum-first" approach to gravity is described, where rather than quantizing general relativity, one seeks to formulate the physics of gravity within a quantum-mechanical framework with suitably general postulates.

• Important guides are the need for appropriate mathematical structure on Hilbert space, and correspondence with general relativity and quantum field theory in weak-gravity situations.
• A basic physical question is that of "Einstein separability:" how to define mutually independent subsystems, e.g.
• through localization.