The unrefined-limit identity for the refined index

Let gn(ref)({γˇi,ci},y)g^{\rm (ref)}_n(\{\check\gamma_i,c_i\},y) be defined by the refined generating-function construction and the reference solution Fn(ref)F^{\rm (ref)}_n, with coefficients bnb_n fixed by the Bernoulli-number formula. Let gn(0)({γˇi,ci})g^{(0)}_n(\{\check\gamma_i,c_i\}) be the unrefined function. Unrefined-limit conjecture.

limy1gn(ref)({γˇi,ci},y)=gn(0)({γˇi,ci}).\lim_{y\to1}g^{\rm (ref)}_n(\{\check\gamma_i,c_i\},y)=g^{(0)}_n(\{\check\gamma_i,c_i\}).

This identifies the refined construction with the unrefined index in the limit y1y\to1; the supplied context establishes smoothness of the limit but gives no resolution of the identity itself.

Sources & referencesView supporting material

Primary source

Sergei Alexandrov and Boris Pioline, “Black holes and higher depth mock modular forms”, arXiv:1808.08479 (2018).

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