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Extending it to the fields that matter, such as massless particles and gravitons in an expanding universe, is open.","posed_since":"","precise":"The cosmological polytope (Arkani-Hamed, Benincasa, Postnikov, 2017) gives wavefunction coefficients of conformally coupled scalars with polynomial interactions in flat space and FRW backgrounds as canonical forms. Find a positive geometry whose canonical form gives tree-level wavefunction coefficients or in-in correlators of massless minimally coupled scalars or gravitons in de Sitter space.","problem_ref":null,"references":"","settled_by":"An explicit geometry reproducing the known four-point graviton or massless-scalar de Sitter wavefunction coefficients.","status_note":"","title":"Positive geometry for de Sitter correlators of massless 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