Ulrich bundles on cyclic coverings of projective spaces

Abstract

We prove the existence of Ulrich bundles on cyclic coverings of ${\mathbb{P}}^n$ of arbitrary degree $d$. Given a relatively Ulrich bundle on a complete intersection subvariety, we construct a relatively Ulrich bundle on the ambient variety. As an application, we prove that there exists a rank $d$ Ulrich bundle on a generic cyclic covering of ${\mathbb{P}}^2$ of degree $d$, provided that the degree $d\cdot k$ of the branch divisor is even. When $d\cdot k$ is odd, we also provide an estimation of the rank of the Ulrich bundle on a generic cyclic covering of ${\mathbb{P}}^2$.

Final version