TITLE: S-matrix for the HOMFLY/Hecke category
QUESTION [12 upvotes]: This question concerns the HOMFLY-PT category, closely related to Hecke algebras.  (See here for example.)  
The minimal idempotents of this category are indexed by pairs $(\lambda_+, \lambda_-)$ of Young diagrams. (The sizes of the diagrams are arbitrary and need not be the same.  The diagram $\lambda_+$ corresponds to upward oriented strands, while $\lambda_-$ corresponds to downward oriented strands.) Consequently one can define numerical invariants of oriented links whose components are labeled by pairs of Young diagrams.  This is the "colored" HOMFLY-PT polynomial.
Of fundamental importance in this subject are the invariants $S_{\lambda_+\lambda_-,\mu_+\mu_-}$ of the Hopf link with its components labeled by pairs of Young diagrams (i.e. idempotents) $(\lambda_+, \lambda_-)$ and $(\mu_+, \mu_-)$.  In TQFT language, this is the "S-matrix" of the theory.
My Question:

Has the S-matrix for the HOMFLY-PT category been calculated and published?  If not, are partial results in this direction known?

I am aware of this paper by Morton and Lukac, which does the case where $\lambda_-$ and $\mu_-$ are both empty (i.e. all strands oriented the same direction).  This paper by Morton and Hadji is also related.  Are there other relevant papers that I have missed?
See also the BMW version of this question here.

REPLY [2 votes]: This isn't a complete answer, but it might make some partial progress. First I'll slightly restate the question. If we decompose $S^3$ into two solid tori and write $C$ and $C^{op}$ for the Homfly skein modules of these tori, then there is a pairing $$\langle -,-\rangle: C\otimes_A C^{op} \to k$$
where $k$ is the base ring (which is isomorphic to the skein module of $S^3$) and $A$ is the Homfly skein algebra of the torus. As you say, both $C$ and $C^{op}$ have bases indexed by pairs of partitions, and if I understand right, the entries of the $S$ matrix are evaluations of this pairing.
One brute-force approach for computing $\langle (\lambda, \mu), (\lambda',\mu')\rangle$ is to "move the left hand side to the right using the action of $A$ and then evaluate." An explicit presentation of $A$ is given here http://arxiv.org/abs/1410.0859. There are generators $P(a,b)$ for $a,b \in \mathbb(Z)$ (which are "the $gcd(a,b)$ power sum on slope $b/a$"), and they satisfy the commutation relations $$[P(x), P(y)] = (q^d-q^{-d}) P(x+y),\quad x,y \in \mathbb Z^2,\quad d = det[x\,\,y]$$
(If $x$ and $y$ are primitive and $d=1$ this is just the skein relation.) The paper also gives explicit formulas for the action of the generators $P(a,b)$ in the basis $(\lambda,\mu)$ that you mentioned, and these formulas actually aren't too bad (e.g. if $a,b \not= 0$ then the entries in the matrix are monomials).
One difficulty in completing the answer is that expressing the basis elements $(\lambda,\mu)$ in terms of power sums isn't too easy. (Morton does have a determinental formulas in terms of complete symmetric functions in one of his papers.) Also, I'm not sure if the evaluations $((\emptyset, \emptyset),(\lambda,\mu)\rangle$ have actually been computed.
(By the way, this algebra $A$ actually has a lot of different realization which are not obviously the same. One other realization is as (a specialization of) the Hall algebra of coherent sheaves on an elliptic curve over a finite field (this is described in the paper above). Also, if you've found these numbers since the question was asked I'd be curious to hear.)