Compact lcK manifolds with Gauduchon parallel vector fields
We prove that on a compact locally conformally K\"ahler manifold, the existence of a non-trivial parallel vector field with respect to a Gauduchon connection $\nabla^t$, for $t\ne \frac{1}{3}$, forces the metric to be either Vaisman (for $t=-1$), globally conformally K\"ahler (for $t=1$), or K\"ahler for all other valu...