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Physical Predictions in Closed Quantum Gravity
cosmology-and-nongalactic-astrophysicsgeneral-relativity-and-quantum-cosmologyhigh-energy-physics-phenomenologyhigh-energy-physics-theory
Recent developments in gravitational path integrals indicate that the nonperturbative physical Hilbert space of a closed universe is one-dimensional within each superselection sector. This raises a basic puzzle: how can a unique quantum-gravity state give rise to semiclassical physics, measurement o
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