Spinning boundary correlators from (A)dS4 twistors

A bstract We develop a twistor-space framework to compute boundary correlators via a boundary limit of nested Penrose transforms in (A)dS 4 . Starting from correlators of (anti-)self-dual bulk fields, the boundary limit reproduces the correlators of the dual conserved currents; we demonstrate this explicitly for two- and three-point functions. The two-point correlator is rendered finite by working in Euclidean signature. At three points, we obtain compact rational twistor-space representatives obeying a double-copy relation, thereby clarifying the twistor-space origin of the results in https://arxiv.org/abs/2408.02727 . We further extend the analysis to non-conserved currents with integer conformal dimension, dual to massive bulk fields, as well as to the free scalar.