Colored HOMFLY-PT homology limit conjecture

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Let B(m)B^{(m)} be the mm-colored version of a braid diagram BB, and let HN(B(m))H_N(B^{(m)}) denote its colored athfraksl(N)athfrak{sl}(N) link homology. Denote by HH the colored HOMFLY-PT link homology, with an appropriate normalization. The quantities min⁡deg⁡q\min\deg_q and max⁡deg⁡q\max\deg_q are the minimum and maximum qq-gradings, respectively. Then colored HOMFLY-PT homology limit conjecture.

lim⁡N→∞min⁡deg⁡qHN(B(m))N−m=min⁡deg⁡xH(B(m)),\lim_{N\rightarrow\infty}\frac{\min\deg_q H_N(B^{(m)})}{N-m}=\min\deg_x H(B^{(m)}), lim⁡N→∞max⁡deg⁡qHN(B(m))N−m=max⁡deg⁡xH(B(m)).\lim_{N\rightarrow\infty}\frac{\max\deg_q H_N(B^{(m)})}{N-m}=\max\deg_x H(B^{(m)}).

Here deg⁡x\deg_x is the degree from the xx-grading corresponding to the framing variable xx of the colored HOMFLY-PT link polynomial. In particular, if ww is the writhe and bb is the number of strands of BB, then

w−b≤min⁡deg⁡xH(B(m))m≤max⁡deg⁡xH(B(m))m≤w+b.w-b\leq\frac{\min\deg_x H(B^{(m)})}{m}\leq\frac{\max\deg_x H(B^{(m)})}{m}\leq w+b.

The conjecture is motivated by the expected generalization of Rasmussen's spectral sequence relating colored HOMFLY-PT link homology to colored sl(N)\mathfrak{sl}(N) link homology. A direct proof of the resulting Morton-Franks-Williams-type inequality was suggested as possible, but the claim remains unresolved in the source.

References

Primary source

Hao Wu, “Colored Morton-Franks-Williams inequalities”, arXiv:1102.0586 (2011).

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