  This manuscript introduces a novel holographic correspondence in
$d$-dimensional de Sitter (dS$_d$) spacetime, connecting bulk dS$_d$ scalar
unitary irreducible representations (UIRs) with their counterparts at the
dS$_d$ boundary ${\cal{I}}^\pm$, all while preserving reflection positivity.
The proposed approach, with potential applicability to diverse dS$_d$ UIRs, is
rooted in the geometry of the complex dS$_d$ spacetime and leverages the
inherent properties of the (global) dS$_d$ plane waves, as defined within their
designated tube domains.
