Quantum-first gravity

Understand

This paper elaborates on an intrinsically quantum approach to gravity, which begins with a general framework for quantum mechanics and then seeks to identify additional mathematical structure on Hilbert space that is responsible for gravity and other phenomena.

• A key principle in this approach is that of correspondence: this structure should reproduce spacetime, general relativity, and quantum field theory in a limit of weak gravitational fields.
• A central question is that of "Einstein separability," and asks how to define mutually independent subsystems, e.g.
• through localization.