A finite-field variety whose Q_ℓ-cohomology ring has no rational form, giving a simply-connected non-liftable example via a new cohomological obstruction.
Nagoya Math
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Non-liftable varieties via etale cohomology rings
A finite-field variety whose Q_ℓ-cohomology ring has no rational form, giving a simply-connected non-liftable example via a new cohomological obstruction.