Multiple solutions for Schrödinger equations on Riemannian manifolds via $\nabla$-theorems

We consider a smooth, complete and non-compact Riemannian manifold $(\mathcal{M},g)$ of dimension $d \geq 3$, and we look for positive solutions to the semilinear elliptic equation $-Δ_g w + V w = αf(w) + λw \quad\hbox{in $\mathcal{M}$}.$ The potential $V \colon \mathcal{M} \to \mathbb{R}$ is a continuous function which is coercive in a suitable sense, while the nonlinearity $f$ has a subcritical growth in the sense of Sobolev embeddings. By means of $\nabla$-Theorems introduced by Marino and Saccon, we prove that at least three solution exists as soon as the parameter $λ$ is sufficiently close to an eigenvalue of the operator $-Δ_g$.

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