A class of generalised Killing spinors determined by the Ricci tensor and the metric

Diego Artacho; Jihun Kim

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arXiv · 2609.29274

A class of generalised Killing spinors determined by the Ricci tensor and the metric

Diego Artacho·Jihun Kim

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Abstract

We introduce a class of generalised Killing spinors, termed affine Killing spinors (AKS), for which the associated endomorphism is a constant linear combination of the Ricci endomorphism and the identity map. We classify Riemannian spin manifolds admitting an AKS under two additional curvature hypotheses: harmonic curvature and local conformal flatness. Furthermore, we characterise Riemannian spin manifolds that admit a non-zero parallel one-form and an AKS. Additionally, we prove that in dimension three every curvature-homogeneous manifold carrying an AKS is locally homogeneous. Finally, we provide a complete classification of three-dimensional Lie groups equipped with a Bianchi metric admitting an invariant AKS.

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Diego Artacho, Jihun Kim. 2026-09-24. A class of generalised Killing spinors determined by the Ricci tensor and the metric. https://arxiv.org/abs/2609.29274

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