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• W2143997612 abstract "The main result of this paper is an application of the topology of the space Q ( X ) to obtain results for the cohomology of the symmetric group on d letters, Σ d , with ‘twisted’ coefficients in various choices of Young modules and to show that these computations reduce to certain natural questions in representation theory. The authors extend classical methods for analyzing the homology of certain spaces Q ( X ) with mod- p coefficients to describe the homology H • ( Σ d , V ⊗ d ) as a module for the general linear group GL ( V ) over an algebraically closed field k of characteristic p . As a direct application, these results provide a method of reducing the computation of Ext Σ d • ( Y λ , Y μ ) (where Y λ , Y μ are Young modules) to a representation theoretic problem involving the determination of tensor products and decomposition numbers. In particular, in characteristic two, for many d , a complete determination of H • ( Σ d Y λ ) can be found. This is the first nontrivial class of symmetric group modules where a complete description of the cohomology in all degrees can be given. For arbitrary d the authors determine H i ( Σ d , Y λ ) for i = 0 , 1 , 2 . An interesting phenomenon is uncovered-namely a stability result reminiscent of generic cohomology for algebraic groups. For each i the cohomology H i ( Σ p a d , Y p a λ ) stabilizes as a increases. The methods in this paper are also powerful enough to determine, for any p and λ , precisely when H • ( Σ d , Y λ ) = 0 . Such modules with vanishing cohomology are of great interest in representation theory because their support varieties constitute the representation theoretic nucleus." @default.
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• W2143997612 date "2010-07-01" @default.
• W2143997612 modified "2023-09-29" @default.
• W2143997612 title "On the cohomology of Young modules for the symmetric group" @default.
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• W2143997612 doi "https://doi.org/10.1016/j.aim.2010.01.004" @default.
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