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It is well known that the \textit{Serrin condition} is a necessary condition for the solvability of the Dirichlet problem for the prescribed mean curvature equation in bounded domains of $\mathbb{R}^n$ with certain regularity. In this paper we investigate this fact for the vertical mean curvature equation in the product $ M^n \times \mathbb{R}$. Precisely, given a $\mathscr{C}^2$ bounded domain $\Omega$ in $M$ and a function $H = H (x, z) $ continuous in $\overline{\Omega}\times\mathbb{R}$ and non-decreasing in the variable $z$, we prove that the \textit{strong Serrin condition} $(n-1)\mathcal{H}_{\partial\Omega}(y) \geq n\sup\limits_{z\in\mathbb{R}} |H(y,z)| \ \forall \ y\in\partial\Omega$, is a necessary condition for the solvability of the Dirichlet problem in a large class of Riemannian manifolds within which are the Hadamard manifolds and manifolds whose sectional curvatures are bounded above by a positive constant. As a consequence of our results we deduce Jenkins-Serrin and Serrin type sharp solvability criteria.

Sharp solvability criteria for Dirichlet problems of mean curvature type in Riemannian manifolds: non-existence results