Mock Jacobi correspondence for dual \widehat{Z}-series of four-fibered Seifert homology spheres

Let Φp[j](q)\Phi_p^{[j]}(q)^\vee be the vector of mock modular forms dual under q1/qq \to 1/q to the linear combination of false theta functions Φp[j](q)\Phi^{[j]}_p(q) associated to the Z^\widehat{Z} invariants of Σ(p1,p2,p3,p4)\Sigma(p_1,p_2,p_3,p_4), where p=p1p2p3p4p=p_1p_2p_3p_4. Let h(p,rj)(q)h_{(p,r_j)}(q) be the coefficients of the theta decomposition for the special mock Jacobi form Qp\mathcal Q_p. Mock Jacobi correspondence. The following relation holds at the level of qq-series:

Φp[j](q)=Ch(p,rj)(q),\Phi_p^{[j]}(q)^\vee=C\,h_{(p,r_j)}(q),

where CQC\in\mathbb{Q} is a normalization constant. This conjecture proposes that the dual qq-series arising from the Z^\widehat{Z} invariants are proportional to the theta-decomposition coefficients of special mock Jacobi forms, extending the correspondence observed in the four-fibered examples and relating Chern--Simons topological invariants to quarter-BPS state-counting structures.

Sources & referencesView supporting material

Primary source

Griffen Adams and Gerald V. Dunne, “The Chern-Simons Natural Boundary and Black Hole Entropy”, arXiv:2603.04619 (2026).

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