The Topological String on the Quintic to Genus 83 and the Rank-Two D4-D2-D0 Indices

Abstract

We compute quintic Gopakumar-Vafa invariants for genera 2-83 and degrees up to 44 by integrating the holomorphic anomaly equations. Under rank-one modularity for the required Gieseker invariants and rank-two charge conjugation, a coupled system of boundary and surplus wall-crossing equations fixes the holomorphic ambiguities and 22 of the 36 polar rank-two D4-D2-D0 coefficients, without assuming any rank-two index. A computer-assisted extension of wall crossing supplies additional equations and the boundary datum needed to close the recursion through genus 83. With known low-genus input, the GV data are complete through degree 32 and yield PT and DT tables. Selected higher-genus wall-crossing invariants reach genus 216; 33 entries require additional hypotheses. Retrospectively selected extrapolations give conditional candidates at genera 84 and 85 and, with rank-two mock modularity, for the remaining polar coefficients.