Cactus-to-toggle factorization conjecture for minuscule crystals

Let g\mathfrak{g} be a simple Lie algebra, let λ\lambda be a minuscule dominant weight, and let w0Jw_0^J be the corresponding Weyl group element. Write CgC_{\mathfrak{g}} for the cactus group, Tog(w0J)Tog(w_0^J) for the toggle group, and RPP(w0J,n)RPP(w_0^J,n) for the reverse plane partitions associated with w0Jw_0^J. The crystal B(nλ)B(n\lambda) is identified with RPP(w0J,n)RPP(w_0^J,n). Cactus-to-toggle factorization conjecture. There is a surjective map

CgTog(w0J)C_{\mathfrak{g}}\to Tog(w_0^J)

such that the action of the cactus group on the crystal

B(nλ)RPP(w0J,n)B(n\lambda)\cong RPP(w_0^J,n)

factors through this map. In type DmD_m, the action of the cactus group on the crystal B(nϖ1)B(n\varpi_1) is generated by cactus elements corresponding to length 11 and 22 subdiagrams of the Dynkin diagram. This conjecture proposes a uniform relationship between cactus-group actions and toggle actions beyond type AA, extending the known connection between Berenstein--Kirillov involutions and cactus groups in type AA and the toggle models for minuscule Demazure crystals in ADEADE types. The status of the proposed factorization and the type DmD_m generation statement is not established in the supplied text.

Sources & referencesView supporting material

Primary source

Devin Brown, Balazs Elek and Iva Halacheva, “Cacti, Toggles, and Reverse Plane Partitions”, arXiv:2412.02614 (2024).

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