Ooguri–Vafa conjecture for framed links

From papers

Let Lτ\mathcal{L}^{\vec{\tau}} be a framed LL-component link with component framings τ=(τ1,,τL)\vec{\tau}=(\tau_1,\ldots,\tau_L). For nonnegative integers r1,,rLr_1,\ldots,r_L, not all zero, let k=#{riri0,i=1,,L}k=\#\{r_i\mid r_i\neq 0, i=1,\ldots,L\}, so that 1kL1\leq k\leq L, and let fr1,,rL(Lτ;q,a)\mathfrak{f}_{r_1,\ldots,r_L}(\mathcal{L}^{\vec{\tau}};q,a) be the coefficient functions obtained from the plethystic logarithm of the generating function of framed colored HOMFLYPT invariants. Ooguri–Vafa conjecture. There exist integers N(r1,,rL),i,j(Lτ)N_{(r_1,\ldots,r_L),i,j}(\mathcal{L}^{\vec{\tau}}), vanishing for sufficiently large i|i| and j|j|, such that

fr1,,rL(Lτ;q,a)=(q12q12)k2i,jZN(r1,,rL),i,j(Lτ)ai2qj2.\mathfrak{f}_{r_1,\ldots,r_L}(\mathcal{L}^{\vec{\tau}};q,a)=(q^{\frac{1}{2}}-q^{-\frac{1}{2}})^{k-2}\sum_{i,j\in\mathbb{Z}}N_{(r_1,\ldots,r_L),i,j}(\mathcal{L}^{\vec{\tau}})a^{\frac{i}{2}}q^{\frac{j}{2}}.

This is the proposed integrality and finite-support property of the framed-link BPS, or Ooguri–Vafa, invariants; the paper presents it as a generalization of the knot case, with no resolution supplied here.

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Sources & referencesView supporting material

Primary source

Kai Wang and Shengmao Zhu, “BPS invariants from framed links”, arXiv:2502.16609 (2025).

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