Dichotomy for the Brauer-Manin obstruction in characteristic p
Let X be a smooth, projective, geometrically integral variety over a global function field k of characteristic p. We show that if the unipotent Brauer group of X is zero, and the Picard scheme of X is torsion free, then only finitely many places of k can be potentially relevant to the Brauer--Manin obstruction for X. In the opposite case, almost all places of k are potentially relevant. If X is base changed from a finite field, then in both cases the finite set of exceptional places is empty. We give an example of a supersingular K3 surface over a global function field k of characteristic p>2 such that Br(X) is finite modulo Br(k), answering a question from our previous paper.
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