Abstract
Given a closed Riemannian manifold $(M,g)$, we use the gradient flow method and Sign-Changing Critical Point Theory to prove multiplicity results for $2$-nodal solutions of a subcritical non-linear equation on $(M,g)$, see \eqref{yam-nodal-1} below. If $(N,h)$ is a closed Riemannian manifold of constant positive scalar curvature our result gives multiplicity results for the Yamabe-type equation on the Riemannian product $(M\times N , g + \ve h )$, for $\ve > 0$ small.
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