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arXiv · 2604.24873

Amplitudes in self-dual (higher-spin) theories

Mattia Serrani·Evgeny Skvortsov
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Abstract

Self-dual theories are powerful toy models of their completions. It was shown recently that there are infinitely many SD-theories once massless higher-spin fields are allowed. The maximal SD-theory is chiral higher-spin gravity. Following the recent [arxiv:2602.12176] we show that all SD-theories, including those with massless higher-spin fields, have nontrivial tree-level amplitudes in Kleinian signature or complex Minkowski kinematics. Within celestial holography, the nontriviality of amplitudes in chiral higher-spin gravity provides the missing ingredient needed to complete the celestial analogue of the vector-model/higher-spin AdS/CFT duality.

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Mattia Serrani, Evgeny Skvortsov. 2026-04-27. Amplitudes in self-dual (higher-spin) theories. https://arxiv.org/abs/2604.24873

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