Trinitree extracted the following paper:
An Underlying Theory for Gravity
Yuan K. Ha
Ha's introduction is an overview of the expected properties of quantum gravity, pointing out that all of the observed properties are classical and because of the weakness of the force, most of the quantum properties will never be testable. This line also caught my eye:
[quote]All quantum field theories of gravity require the graviton as a mediating particle. The graviton corresponds to the weak field perturbation on a flat background spacetime.However, the graviton propagating in a flat spacetime contradicts the background independence of general relativity.[/q]
Isn't there a realization in this statement a fundamental contradiction between Relativity and Quantum concepts that cannot be resolved? A paradox that grounds one or both root theories as falsified? Sure, you can renormalize into comparable states, but renormalizing is nothing less than a statistical fudge factor that admits uncalculable nuances in our physical world.
We believe that gravity is in a similar situation. It would be impossible to quantize general relativity to achieve the smallest units of space and time in order to arrive at an underlying theory of gravity. A new structure with new degrees of freedom is needed. It is the statistical mechanics of spacetime.