Existence of nondegenerate $\mathbb{Z}_2$ harmonic 1-forms via $\mathbb{Z}_3$ symmetry

Using $\mathbb{Z}_3$ symmetry, we present a topological condition for the existence of the $\mathbb{Z}_2$ harmonic 1-forms over Riemannian manifold. As a corollary, if $L$ is an oriented link on $S^3$ with determinant zero, then there exists a nondegenerate $\mathbb{Z}_2$ harmonic 1-form over the 3-cyclic branched covering of $L$. Furthermore, we found infinite number of rational homology 3-spheres that admit a nondegenerate $\mathbb{Z}_2$ harmonic 1-form.

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