Exact and finite de Sitter QFT from CFT

A bstract Parallel to the AdS Scale-Space construction in [1], we construct a ( d + 1)-dimensional de Sitter QFT directly from d -dimensional CFT data. The dS geometry is the moduli space of oriented balls, and the lifted operators are obtained by conformal-family Casimir completion. The Euclidean parent CFT gives a finite wavefunction representation, while the Minkowski parent CFT gives a double-time representation that is unitary in the parent-time polarization. This provides a CFT-based framework for reexamining puzzles of dS and double-time QFT.