Monomial realization conjecture for generalized minors and Demazure crystals

Let II be the index set of the root system, let i=(i1,,iN)\mathbf i=(i_1,\ldots,i_N) be a reduced expression of the longest Weyl-group element, and let p=(pi,j)ijp=(p_{i,j})_{i\ne j} be the associated integer data. For each iIi\in I, let Θi(c)\Theta_{\mathbf i}^-(c), π+\pi^+, η\eta, χi\chi_i, and the generalized minors Δw0Λi,siΛi\Delta_{w_0\Lambda_i,s_i\Lambda_i} and Δw0siΛi,Λi\Delta_{w_0s_i\Lambda_i,\Lambda_i} be as in the preceding construction. Let Bw(i)B(Λk)B^-_w(i)\subset B(\Lambda_k) and Bw+(i)B(Λj)B^+_{w'}(i)\subset B(\Lambda_j) be Demazure crystals, and let mb(c)Y(p)m_b(c)\in\mathcal Y(p) denote the monomial corresponding to bb in the monomial realization associated with pp. Monomial realization conjecture. There exists a reduced expression i\mathbf i of the longest Weyl-group element and data pp such that, for every iIi\in I, there are Demazure crystals Bw(i)B^-_w(i) and Bw+(i)B^+_{w'}(i) and positive integers aba_b and aba_{b'} satisfying

χi(π+(w01tΘi(c)))=Δw0Λi,siΛi(Θi(c))=bBw(i)abmb(c),\chi_i\bigl(\pi^+(w_0^{-1}t\Theta_{\mathbf i}^-(c))\bigr)=\Delta_{w_0\Lambda_i,s_i\Lambda_i}\bigl(\Theta_{\mathbf i}^-(c)\bigr)=\sum_{b\in B^-_w(i)}a_bm_b(c),

and

χi(π+(w01η(tΘi(c))))=αi(t)Δw0siΛi,Λi(Θi(c))=αj(t)bBw+(i)abmb(c).\chi_i\bigl(\pi^+(w_0^{-1}\eta(t\Theta_{\mathbf i}^-(c)))\bigr)=\alpha_i(t)\Delta_{w_0s_i\Lambda_i,\Lambda_i}\bigl(\Theta_{\mathbf i}^-(c)\bigr)=\alpha_j(t)\sum_{b'\in B^+_{w'}(i)}a_{b'}m_{b'}(c).

The conjecture proposes a simultaneous Demazure-crystal monomial expansion for the two generalized minors arising from the decorated geometric-crystal construction. It extends the explicitly verified type AnA_n examples and would connect generalized minors, geometric crystals, and monomial realizations of crystal bases; the source provides no resolution.

Sources & referencesView supporting material

Primary source

Toshiki Nakashima, “Decorated Geometric Crystals, Polyhedral and Monomial Realizations of Crystal Bases”, arXiv:1203.2112 (2012).

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