Conformal invariants for the zero mode equation

For non-trivial solutions to the zero mode equation on a closed spin manifold $D φ=iA\cdot φ,$ we first provide a simple proof for the sharp inequality \eq{ \norm{A}_{L^n}^2 \ge \frac {n}{4(n-1)} Y(M,[g]), } where $Y(M,[g])$ is the Yamabe constant of $(M,g)$, which was obtained by Frank-Loss and Reuss. Then we classify completely the equality case by proving that equality holds if and only if $φ$ is a Killing spinor, and if and only if $(M,g)$ is a Sasaki-Einstein manifold with $A$ (up to scaling) as its Reeb field and $φ$ a vacuum up to a conformal transformation. More generalizations have been also studied.

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