Cylindric loop Schur function conjecture for rigged-configuration shapes

Let B=B1,s1B1,smB=B^{1,s_1}\otimes\cdots\otimes B^{1,s_m} be a product of one-row crystals, let p=b1bmBp=b_1\otimes\cdots\otimes b_m\in B, and define xj(i+j1)x_j^{(i+j-1)} to be the number of occurrences of the letter ii in bm+1jb_{m+1-j}. For 1sn11\leq s\leq n-1, let λ(s,0)=(ns)m\lambda(s,0)=(n-s)^m, and recursively obtain λ(s,r+1)\lambda(s,r+1) by removing the largest ribbon strip containing the bottom row and having at most nn boxes. Let Ds(λ(s,r))\mathscr{D}_s(\lambda(s,r)) be the periodic propagation of λ(s,r)\lambda(s,r) by shifting nsn-s steps right and ss steps up. Cylindric loop Schur function conjecture. For every integer r1r\geq 1,

trop(sDs(λ(s,r1))(0)sDs(λ(s,r))(0))(xj(i))=νr(s),\operatorname{trop}\left(\frac{s_{\mathscr{D}_s(\lambda(s,r-1))}^{(0)}}{s_{\mathscr{D}_s(\lambda(s,r))}^{(0)}}\right)(x_j^{(i)})=\nu_r^{(s)},

where νr(s)\nu_r^{(s)} is the rr-th part in the ss-th shape of the rigged configuration Φ(p)\Phi(p). This conjectures that the shapes of rigged configurations are obtained by tropicalizing ratios of cylindric loop Schur functions, extending the known relation between affine-crystal energy functions and tropicalized loop Schur functions; the status of the general assertion is not resolved in the supplied text.

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Primary source

Thomas Lam, Pavlo Pylyavskyy and Reiho Sakamoto, “Rigged Configurations and Cylindric Loop Schur Functions”, arXiv:1410.4455 (2016).

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