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We consider higher-spin gravity in (Euclidean) AdS_4, dual to a free vectormodel on the 3d boundary. In the bulk theory, we study the linearized versionof the Didenko-Vasiliev black hole solution: a particle that couples to thegauge fields of all spins through a BPS-like pattern of charges. We study theinteraction between two such particles at leading order. The sum over spinscancels the UV divergences that occur when the two particles are brought closetogether, for (almost) any value of the relative velocity. This is ahigher-spin enhancement of supergravity's famous feature, the cancellation ofthe electric and gravitational forces between two BPS particles at rest. In theholographic context, we point out that these "Didenko-Vasiliev particles" arejust the bulk duals of bilocal operators in the boundary theory. For thisidentification, we use the Penrose transform between bulk fields and twistorfunctions, together with its holographic dual that relates twistor functions toboundary sources. In the resulting picture, the interaction between twoDidenko-Vasiliev particles is just a geodesic Witten diagram that calculatesthe correlator of two boundary bilocals. We speculate on implications for apossible reformulation of the bulk theory, and for its non-locality issues.

Bulk interactions and boundary dual of higher-spin-charged particles