Siqing Zhang

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20242026

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math.AG2026

Non-liftable varieties via etale cohomology rings

Runjie Hu, Siqing Zhang

We construct a smooth projective variety in positive characteristic whose $Q_{ℓ}$ -coefficient etale cohomology ring is not the scalar extension of any graded $\mathbb{Q…

math.AG2024

Topology of $G_{m}$ -actions and applications to the moduli of Higgs bundles

Andres Fernandez Herrero, Siqing Zhang

We explain some results concerning the topology of varieties and stacks equipped with an action of the multiplicative group $G_{m}$ . We apply these techniques to the moduli…

Non-liftable varieties via etale cohomology rings

Topology of Gm​-actions and applications to the moduli of Higgs bundles

Topology of $G_{m}$ -actions and applications to the moduli of Higgs bundles