Gerbe-independence conjecture for virtual fundamental classes
Gerbe-independence conjecture for virtual fundamental classes
Let be the coarse projective variety in the KSBA moduli problem, let be a -gerbe, and let be the associated KSBA moduli space. Suppose that the virtual fundamental class is defined by pushing forward the virtual class from the moduli space of index one covers:
Here is sufficiently large and divisible by the orders of the cyclic groups occurring in the index one covering DM stacks. Gerbe-independence conjecture. For large divisible , the class is independent of the choice of the -gerbe .
The conjecture asks whether the enumerative virtual class descends independently of the auxiliary gerbe used to construct it. The supplied text explicitly says that this independence is currently unknown.
Sources & referencesView supporting material
Primary source
Yunfeng Jiang, “Enumerative Geometry on KSBA moduli spaces”, arXiv:2605.19923 (2026).
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