Broué's regular-element conjecture for splendid Rickard complexes

Assume the regular-element setting of the source: L=T=CG(D){\mathbf L}={\mathbf T}=C_{\mathbf G}(D) is a torus, OGb{\mathcal O}Gb is the principal block, (q1)\ell\nmid(q-1), FF acts trivially on the Weyl group, wdw_d is the specified good regular element of order d>1d>1, and H/CG(D)CW(wd)H/C_G(D)\simeq C_W(w_d). Let BdB_d be the braid group of CW(wd)C_W(w_d) and let Y(wd)Y(w_d) be the associated Deligne–Lusztig variety. Broué's regular-element conjecture. There is a complex

CKb((OGb)(OHbD)opp-lperm)C\in K^b(({\mathcal O}Gb)\otimes({\mathcal O}Hb_D)^{\operatorname{opp}}\operatorname{-lperm})

unique up to isomorphism, together with the surjective morphism and the two compatibility properties stated in the source; moreover, such a complex induces a Rickard equivalence between OGb{\mathcal O}Gb and OHbD{\mathcal O}Hb_D. This is a precise splendid refinement of the Deligne–Lusztig form of Broué's conjecture. The source records several special cases but leaves the general assertion open.

Sources & referencesView supporting material

Primary source

Raphael Rouquier, “Derived equivalences and finite dimensional algebras”, arXiv:math/0603356 (2006).

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