Point-independence conjecture for log BPS numbers

Let (S,E)(S,E) be a rational log Calabi-Yau surface with smooth divisor and let βH2(S,Z)\beta\in\operatorname{H}_2(S,\mathbb{Z}). For PE(β)P\in E(\beta), let mβPm^P_\beta denote the log BPS number at PP, and let mβtotm^{tot}_\beta be the total log BPS number; write ww for the relevant intersection number. Point-independence conjecture. For all P,PE(β)P,P'\in E(\beta),

mβP=mβP.m^P_\beta=m^{P'}_\beta.

Equivalently, for all PE(β)P\in E(\beta),

mβtot=w2mβP.m^{tot}_\beta=w^2m^P_\beta.

The claim asserts that the log BPS contribution is independent of the point of maximal tangency. The surrounding text notes that the corresponding log counts can differ before imposing this conjectural BPS-level symmetry.

Sources & referencesView supporting material

Primary source

Jinwon Choi, Michel van Garrel, Sheldon Katz and Nobuyoshi Takahashi, “Log BPS numbers of log Calabi-Yau surfaces”, arXiv:1810.02377 (2020).

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