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- W2023752502 abstract "Let ( {H^*}left( {{mathcal{B}_e}} right) ) be the total Springer representation of W for the nilpotent element e in a simple Lie algebra ( mathfrak{g} ). Let Λi V denote the ith exterior power of the reflection representation V of W. The focus of this paper is on the algebra of W-invariants in $$ {H^*}left( {{mathcal{B}_e}} right) otimes {Lambda^*}V $$and we show that it is an exterior algebra on the subspace ( {left( {{H^*}left( {{mathcal{B}_e}} right) otimes V} right)^W} ) in some cases that were not previously known. This result was established for e = 0 by Solomon [28] and was proved by Henderson [17] in types A, B, C when e is regular in a Levi subalgebra.The above statement about the W-invariants implies a conjecture of Lehrer–Shoji [19] about the occurrences of Λi V in ( {H^*}left( {{mathcal{B}_e}} right) ), which was originally stated when e is regular in a Levi subalgebra. In this paper we prove the Lehrer–Shoji conjecture in all types and its natural extension to any nilpotent e, not only those that are regular in a Levi subalgebra.In the last part of the paper we make a connection to rational Cherednik algebras and this leads to an explanation for the appearance in Springer theory of the Orlik–Solomon exponents coming from hyperplane arrangements. This connection was established in the classical groups in [19], [30] after being observed empirically by Orlik, Solomon, and Spaltenstein in the exceptional groups." @default.
- W2023752502 created "2016-06-24" @default.
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- W2023752502 date "2011-06-04" @default.
- W2023752502 modified "2023-09-26" @default.
- W2023752502 title "Exterior powers of the reflection representation in Springer theory" @default.
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- W2023752502 doi "https://doi.org/10.1007/s00031-011-9148-3" @default.
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