3 papers
math.AG2026
Shifted symplectic rigidification
Hyeonjun Park, Jemin You
We construct shifted symplectic derived enhancements on rigidified moduli spaces of sheaves on Calabi-Yau varieties of dimension at least two. More generally, we prove that any $B\…
math.AG2025
Counting surfaces on Calabi-Yau 4-folds I: Foundations
Younghan Bae, Martijn Kool, Hyeonjun Park
This is the first part in a series of papers on counting surfaces on Calabi-Yau 4-folds. Besides the Hilbert scheme of 2-dimensional subschemes, we introduce \emph{two} types of mo…
math.AG2025
Virtual localization revisited
Dhyan Aranha, Adeel A. Khan, Alexei Latyntsev +2
Let be a split torus acting on an algebraic scheme with fixed locus . Edidin and Graham showed that on localized -equivariant Chow groups, (a) push-forward alon…