Question

Does a complete theory of quantum gravity require anthropic post-selection?

Answer 1

Does a complete theory of quantum gravity require anthropic post-selection? Certainly the black hole complimentarity and causal patch conjectures highlights the essential role of observers, at least in the asymptotic future of their future timelike trajectories. Does the measure problem in quantum gravity cosmology suggest that a "global god's eye view" of the universe might be an incoherent fiction? However, if observers are essential, don't we have to post-select to those states containing the observer of interest

Answer 2

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✔️✔️Any postselection criteria also needs to be invariant under timelike diffeomorphisms, no So, postselection criteria only at the conformal boundaries, no? Basically, only consider those diffeomorphisms which don't act upon boundary points.

A boundary condition on diffeomorphisms.

If there is anthropic postselection, diffeomorphism invariance requires that to happen someplace on the conformal boundaries of spacetime.

Could it be at the past boundary at the big bang no. So only the future conformal boundary of spacetime then This supports the final anthropic principle of Tipler and Barrow.

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