Insufficiency of the Brauer-Manin obstruction for Enriques surfaces

Francesca Balestrieri, Jennifer Berg, Michelle Manes +2

In 2011, Vàrilly-Alvarado and the last author constructed an Enriques surface $X$ over $\mathbb{Q}$ with an étale-Brauer obstruction to the Hasse principle and no algebraic Brauer-…