Rational points of fixed denominator in real toric arrangements

Abstract

We give a sufficient condition on a positive integer $m$ for every stratum of a given real toric hyperplane arrangement to contain a rational point of denominator $m$. As a consequence, we give a sufficient condition on $m$ for the degree $m$ Frobenius pushforward of the structure sheaf on a smooth toric variety to contain all possible summands in the Picard group.

arXiv comment8 pages, 2 figures, v2:minor updates in exposition