The orbit conjecture for real reduced double Bruhat cells

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Let GG be a split semisimple algebraic group with Weyl group WW, and let Lu,v=Nu‾N∩B−vB−L^{u,v}=N\overline{u}N\cap B_-vB_- be the reduced double Bruhat cell for u,v∈Wu,v\in W. For a reduced word i∈R(u,v)\mathbf{i}\in R(u,v), write Γi(F2)\Gamma_{\mathbf{i}}(\mathbb{F}_2) for the associated group acting on F2ℓ(u)+ℓ(v)\mathbb{F}_2^{\ell(u)+\ell(v)}. Orbit conjecture. For every two elements uu and vv in WW, and every reduced word i∈R(u,v)\mathbf{i}\in R(u,v), the connected components of Lu,v(R)L^{u,v}(\mathbb{R}) are in a natural bijection with the Γi(F2)\Gamma_{\mathbf{i}}(\mathbb{F}_2)-orbits in F2ℓ(u)+ℓ(v)\mathbb{F}_2^{\ell(u)+\ell(v)}. In the case G=SLnG=SL_n and v=w0v=w_0, this was proved for a special reduced word, so the general assertion is a theorem in the stated special case but is not established here in full generality.

References

Primary source

Boris Shapiro, Michael Shapiro, Alek Vainshtein and Andrei Zelevinsky, “Simply-laced Coxeter groups and groups generated by symplectic transvections”, arXiv:math/9906203 (1999).

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