Abstract
In a complex manifold, one can bridge anti-de Sitter and de Sitter spacetimes via analytic continuation, preserving geometric invariants and regularity, avoiding singularities during the AdS-dS transition. It unifies gravitational and gauge interactions under a complexified symmetry group, maintaining bulk unitarity for both AdS and dS. Boundary unitarity is upheld in AdS but not in dS due to the spacelike conformal boundary. The theory uses holographic principles like the MacDowell-Mansouri and Quantum Extremal Surface prescriptions to align entanglement and black hole entropy with AdS/CFT and general relativity. HUFT provides insights into AdS and dS holography, the cosmological constant, and quantum gravity unitarity and entanglement.
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