Regularized formula for positive integer surgery

About 5 years old · traced to

Let the +p+p-surgery formula of Gukov and Manolescu be given, and let the regularization be defined using the identity

1∏j=1n(x+x−1−qj−q−j)∣xu↦δb,u(mod⁡p)q−u2p=(−1)nqn(n+1)2(qn+1)nqb(p−b)pPnp,b(q−1).\frac{1}{\prod_{j=1}^{n}(x+x^{-1}-q^j-q^{-j})}\bigg\vert_{x^u\mapsto \delta_{b,u(\operatorname{mod} p)}q^{-\frac{u^2}{p}}} = \frac{(-1)^n q^{\frac{n(n+1)}{2}}}{(q^{n+1})_n}q^{\frac{b(p-b)}{p}}P_{n}^{p,b}(q^{-1}).

Regularized +p+p-surgery formula. When the +p+p-surgery formula of Gukov and Manolescu converges, it should be used; when it does not converge, the displayed identity should regularize it, provided that the regularization converges. This proposes a way to extend the positive-surgery formula beyond its original domain of convergence, with the convergence of the regularized expression remaining the essential condition.

References

Primary source

Sunghyuk Park, “Inverted state sums, inverted Habiro series, and indefinite theta functions”, arXiv:2106.03942 (2021).

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