Adding an extra Euclidean boundary to the no-boundary de Sitter path integral defines a family of excited states whose holographic correlators are modified relative to the vacuum.
Hartle and S.W.Hawking, Wave function of the universe , Phys
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The (No) Boundary Proposal and excited states in de Sitter holography
Adding an extra Euclidean boundary to the no-boundary de Sitter path integral defines a family of excited states whose holographic correlators are modified relative to the vacuum.