The Weyl-group bound for components of affine Springer fibers

Let g\mathfrak{g} be the Lie algebra of GG over the local field FF, let Xγ\mathcal{X}_\gamma be the affine Springer fiber associated with γ\gamma, and let T\mathcal{T} act on its geometric base change Xγ×Speckˉ\mathcal{X}_\gamma\times\operatorname{Spec}\bar{k}. Let WW be the Weyl group, and let depth(γ)\operatorname{depth}(\gamma) denote the depth of γ\gamma.

Weyl-group component bound conjecture. For any regular semisimple γg\gamma\in\mathfrak{g}, the number of T\mathcal{T}-orbits of components of Xγ×Speckˉ\mathcal{X}_\gamma\times\operatorname{Spec}\bar{k} is at most the order of the Weyl group. Moreover, equality holds when

depth(γ)=1.\operatorname{depth}(\gamma)=1.

This conjecture concerns the expected Weyl-group-sized control of geometric components of affine Springer fibers and is stated alongside the regular-representation conjecture. The source gives no evidence of resolution.

Sources & referencesView supporting material

Primary source

Cheng-Chiang Tsai, “Components of affine Springer fibers”, arXiv:1609.05176 (2017).

Additional references

3 papers in this index state this conjecture (1998–2016). The statement above is taken from the most recent of them; the others are arXiv:0809.2374, arXiv:math/9812022.

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