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$\mathcal{H}$-Killing Spinors and Spinorial Duality for Homogeneous 3-$(α,δ)$-Sasaki Manifolds (2309.16610v1)

Published 28 Sep 2023 in math.DG

Abstract: We show that $3$-$(\alpha,\delta)$-Sasaki manifolds admit solutions of a certain new spinorial field equation (the $\mathcal{H}$-Killing equation) generalizing the well-known Killing spinors on $3$-Sasakian manifolds. These $\mathcal{H}$-Killing spinors have more desirable geometric properties than the spinors obtained by simply deforming a $3$-Sasakian metric; in particular we obtain a one-to-one correspondence between $\mathcal{H}$-Killing spinors on dual pairs of homogeneous $3$-$(\alpha,\delta)$-Sasaki spaces. Finally, we show that $\mathcal{H}$-Killing spinors generalize certain special spinors in dimension $7$ previously constructed by Agricola-Friedrich and Agricola-Dileo using $\text{G}_2$-geometry.

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