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Let $\mathcal{E}$ be a Hermitian vector bundle over a Riemannian manifold $M$with metric $g$, let $\nabla$ be a metric covariant derivative on$\mathcal{E}$. We study the generalized Ornstein-Uhlenbeck differentialexpression $P^{\nabla}=\nabla^{\dagger}\nablau+\nabla_{(d\phi)^{\sharp}}u-\nabla_{X}u+Vu$, where $\nabla^{\dagger}$ is theformal adjoint of $\nabla$, $(d\phi)^{\sharp}$ is the vector fieldcorresponding to $d\phi$ via $g$, $X$ is a smooth real vector field on $M$, and$V$ is a self-adjoint locally integrable section of the bundle $\textrm{End}\mathcal{E}$. We show that (the negative of) the maximal realization$-H_{p,\max}$ of $P^{\nabla}$ generates an analytic quasi-contractive semigroupin $L^p_{\mu}(\mathcal{E})$, $1<p<\infty$, where $d\mu=e^{-\phi}d\nu_{g}$, with$\nu_{g}$ being the volume measure. Additionally, we describe a Feynman-Kacrepresentation for the semigroup generated by $-H_{p,\max}$. For theOrnstein-Uhlenbeck differential expression acting on functions, that is,$P^{d}=\Delta u+(d\phi)^{\sharp}u-Xu+Vu$, where $\Delta$ is the (non-negative)scalar Laplacian on $M$ and $V$ is a locally integrable real-valued function,we consider another way of realizing $P^{d}$ as an operator in $L^p_{\mu}(M)$and, by imposing certain geometric conditions on $M$, we prove anothersemigroup generation result.

Generalized Ornstein--Uhlenbeck Semigroups in weighted $L^p$-spaces on Riemannian Manifolds