%0 Journal Article
%T Vanishing theorems for linearly obstructed divisors
%A Olivia Dumitrescu
%A Elisa Postinghel
%J Mathematics
%D 2014
%I arXiv
%X We study divisors in the blow-up of $\mathbb{P}^n$ at points in general position that are non-special with respect to the notion of linear speciality introduced in [5]. We describe the cohomology groups of their strict transforms via the blow-up of the space along their linear base locus. We extend the result to non-effective divisors that sit in a small region outside the effective cone. As an application, we describe linear systems of divisors in $\mathbb{P}^n$ blown-up at points in star configuration and their strict transforms via the blow-up of the linear base locus. Finally we illustrate in one famous special example how to combine these techniques with degenerations in order to translate non-linear obstructions to linear obstructions.
%U http://arxiv.org/abs/1403.6852v1