Finite-generation conjecture for twisted quasimap series of P2×P1{\mathbb P}^2 \times {\mathbb P}^1

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Let

FgSQ(q1,q2)=∑d1,d2≥0Ng,(d1,d2)SQq1d1q2d2\mathcal{F}^{\mathsf{SQ}}_g(q_1,q_2)=\sum_{d_1,d_2\ge0}N^{\mathsf{SQ}}_{g,(d_1,d_2)}q_1^{d_1}q_2^{d_2}

be the ((3;2),(0;0))((3;2),(0;0))-twisted genus-gg quasimap series of P2×P1{\mathbb P}^2\times{\mathbb P}^1, and let

L(q1)=(1−27q1)−1/3,B1′(q1)=q1∂∂q1I1E(q1),L(q_1)=(1-27q_1)^{-1/3},\qquad B_1'(q_1)=q_1\frac{\partial}{\partial q_1}I_1^E(q_1),

with X(q1)=q1(∂B1′/∂q1)/(1+B1′)X(q_1)=q_1(\partial B_1'/\partial q_1)/(1+B_1'). Twisted elliptic-fibration quasimap conjecture. One has

q1∂∂q1F1SQ(q1,q2)∈C[[q2]][L3,B1′,X],q_1\frac{\partial}{\partial q_1}\mathcal{F}^{\mathsf{SQ}}_1(q_1,q_2)\in\mathbb C[[q_2]][L^3,B_1',X],

and, for g≥2g\ge2,

FgSQ(q1,q2)∈C[[q2]][L3,B1′,X].\mathcal{F}^{\mathsf{SQ}}_g(q_1,q_2)\in\mathbb C[[q_2]][L^3,B_1',X].

The claim is based on low-degree calculations; the source does not state whether it has been resolved.

References

Primary source

Hyenho Lho, “Gromov-Witten invariants of Calabi-Yau fibrations”, arXiv:1904.10315 (2019).

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