Crystal and global-basis conjecture for type-D affine Hecke representations

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Let I={pn;n∈Zodd}I=\{p^n\mathbin{;}n\in\mathbb Z_{\mathrm{odd}}\}, with neither 11 nor −1-1 in II, and let θ(a)=a−1\theta(a)=a^{-1}. Let KD,IK_{D,I} be the Grothendieck group of finite-dimensional type-II modules over the type-D affine Hecke algebras, and let (Vθ)A(V_\theta)_\mathbf A be the integral form of the module VθV_\theta. Type-D representation-theoretic conjecture. The following hold: KD,I≃(Vθ)A/(q−1)(Vθ)AK_{D,I}\simeq (V_\theta)_\mathbf A/(q-1)(V_\theta)_\mathbf A; VθV_\theta has a crystal basis and an upper global basis; the classes associated with irreducible representations correspond to the upper global basis at q=1q=1; and the operators F~i\widetilde F_i and E~i\widetilde E_i correspond respectively to the representation-theoretic operators f~i\widetilde f_i and e~i\widetilde e_i. This would realize the Grothendieck group of type-D affine Hecke representations through the crystal and global-basis structure of VθV_\theta.

References

Primary source

Masaki Kashiwara and Vanessa Miemietz, “Crystals and affine Hecke algebras of type D”, arXiv:math/0703281 (2007).

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