Awesome! I've gotta see this. We have the quantum gravity but with can we use for the nothing?
Say Doc, you got a minute? :lol:
Using the field equations, you derive the Friedmann equations to describe the large scale structure of the universe. Then you write those equations in a Hamiltonian form and subsequently convert it to a quantum theory by performing canonical quantization.
What you end up with is a quantum theory with a negative potential. Then, although the total energy may be zero the state of the system can evolve into the area of negative total potential by creating positive kinematical energy in the gravitational field which balances the negative energy of the total gravitational potential.
The same sort of thing happens with a hydrogen atom. Start an electron (the universe by analogy) off with zero energy. A proton (the gravitational field of the Friedmann-Robertson-Walker universe) has a negative potential with respect to the free electron. During evolution, the electron radiates photons (matter) and subsequently becomes bound to the proton. The energy will always balance to zero.
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