Causality of higher-spin interactions, with application to de Sitter space

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Abstract

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Higher-spin gravity is a working model of quantum gravity in 4-dimensional de Sitter space. We discuss it at the level of cubic interactions, in a lightcone formalism originally developed for Minkowski and AdS. We use the interactions’ chiral structure to unlock a broader class of lightcone frames. This makes the formalism applicable to de Sitter, and brings out a causal property of the transformation between frames. We use this property to describe an evolution problem in a causal diamond, and especially in the largest causal diamond in de Sitter space – the static patch.