Mirror-series and Calabi–Yau quantum-cohomology conjecture from recursive descent

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Let L~mN,k,d\widetilde L_m^{N,k,d} denote the result of formally iterating the recursive functions for fixed kk while descending NN to N=kN=k, and let L~mk,k\widetilde L_m^{k,k} be the associated generating function. Let ada_d and bdb_d be the coefficients of the hypergeometric series used in the mirror calculation, and let Lik,k(et)L_i^{k,k}(e^t) denote the quantum-cohomology structure constants after the mirror-coordinate change.

Calabi–Yau mirror-recursion conjecture. Formal iteration of the laws of Conjecture 2 down to N=kN=k should give

kdkad=L~0k,k,d,k^{dk}a_d=\widetilde L_0^{k,k,d}, kdkbd=1dL~1k,k,d+∑m=1d−11mL~1k,k,mL~0k,k,d−m,k^{dk}b_d=\frac{1}{d}\widetilde L_1^{k,k,d}+\sum_{m=1}^{d-1}\frac{1}{m}\widetilde L_1^{k,k,m}\widetilde L_0^{k,k,d-m},

and should give the structure constants of the quantum cohomology ring of the degree-kk Calabi–Yau hypersurface through

Lik,k(et)=L~ik,k(ex(t))L~1k,k(ex(t)).L_i^{k,k}(e^t)=\frac{\widetilde L_i^{k,k}(e^{x(t)})}{\widetilde L_1^{k,k}(e^{x(t)})}.

This conjecture connects formal recursive descent with the hypergeometric series and the quantum cohomology of Calabi–Yau hypersurfaces. It is presented as a consequence expected from the preceding recursive conjectures, with no resolution stated.

References

Primary source

A. Collino and M. Jinzenji, “On the Structure of the Small Quantum Cohomology Rings of Projective Hypersurfaces”, arXiv:hep-th/9611053 (1999).

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