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CCCC – p. 8<br />
Consistent loop quantum gravity<br />
→ Off-shell closed operator algebra of constraints likely?<br />
→ Semiclassical states (at dynamical level)?<br />
More realistic (at least in particle-physics analogy):<br />
Effective equations.<br />
→ Ease subtleties of factor ordering and quantum<br />
representation.<br />
→ Describe general classes of semiclassical states without<br />
requiring full wave function.<br />
(Vacuum problem of quantum gravity.)<br />
→ Can be generalized to constrained systems. Allow local<br />
internal times and time changes by gauge transformations.<br />
→ Simpler derivation of closed constraint algebras.<br />
But still incomplete.