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arXiv · 2610.23384

Spinors, Doppelgängers and the Non-Perturbative Classical Double Copy

Kymani Armstrong-Williams
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Abstract

We develop a geometric and spinorial formulation of the non-perturbative classical double copy between the Corrigan--Fairlie--'t Hooft--Wilczek sector of complexified SU(2) Yang--Mills theory and four-dimensional conformally flat gravity. We identify the gauge potential with the positive-chiral spin connection of the conformally flat metric, establishing an exact relation between the Yang--Mills field strength and the chiral projection of the Riemann tensor. This provides a four-dimensional realisation of the doppelgänger viewpoint, in which gauge and gravitational fields arise from different interpretations of common connection data. Within this sector, the sourceless Yang--Mills equations require constant scalar curvature, explaining the shared nonlinear scalar equation and extending the gravitational correspondence from traceless matter to matter with constant energy--momentum trace. By representing adjoint colour indices as symmetric pairs of spinor indices, we derive exact relations mapping the gauge field-strength spinors to the scalar-curvature and trace-free Ricci components of the gravitational curvature. These relations retain nontrivial curvature information despite the vanishing Weyl tensor. We illustrate the construction using anti-de Sitter and de Sitter spacetimes, together with $\mathrm{AdS}_{3}\times\mathbb{R}$ supported by a scalar field, demonstrating the extension to matter with nonzero constant trace

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Kymani Armstrong-Williams. 2026-10-16. Spinors, Doppelgängers and the Non-Perturbative Classical Double Copy. https://arxiv.org/abs/2610.23384

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