Verra fourfolds have a distinct small quantum cohomology ring implying they are never birational to very general cubic or Gushel-Mukai fourfolds, with primitive cohomology matching a K3 surface when birational.
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math.AG 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
Defines naive atomic decompositions and checks a naive version of Iritani's blowup formula in computable examples.
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Quantum cohomology and birational geometry of Verra fourfolds
Verra fourfolds have a distinct small quantum cohomology ring implying they are never birational to very general cubic or Gushel-Mukai fourfolds, with primitive cohomology matching a K3 surface when birational.
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Naive atoms of blowups: examples
Defines naive atomic decompositions and checks a naive version of Iritani's blowup formula in computable examples.