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A bstract We derive parity-even transverse-traceless metric-like cubic vertices for massless bosonic higher-spin fields in AdS 3 . Starting from the known two- and three-derivative vertices in three-dimensional flat space, we construct their AdS 3 extensions by imposing gauge invariance and accounting for dimension-dependent identities. The result is shown to be consistent with minimal coupling to gravity.
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King et al. (2026) studied this question.
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