Marked-Dyck-path formula at q=1q=1 for torus-knot homology

Let Ps2k(Tn,m)(q,t)\mathcal{P}_{s}^{2k}(T_{n,m})(q,t) denote the relevant coefficient of the triply graded Poincaré polynomial, and let the sum range over all marked Dyck paths in the m×nm\times n rectangle with kk marks; write S(π)S(\pi) for the area above the path. Marked-Dyck-path conjecture.

Ps2k(Tn,m)(1,t)=tkπt2S(π).\mathcal{P}_{s}^{2k}(T_{n,m})(1,t)=t^{k}\sum_{\pi}t^{2S(\pi)}.

This extends the preceding (n,n+1)(n,n+1) formula to general torus knots and gives a combinatorial model for the q=1q=1 specialization; the source does not provide a resolution status.

Sources & referencesView supporting material

Primary source

E. Gorsky, “q,t-Catalan numbers and knot homology”, arXiv:1003.0916 (2011).

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