Geodesic
Bases for certain cohomology representations of the symmetric group.
Journal of Algebraic Combinatorics, Tome 24 (2006) no. 4, pp. 361-390.

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Summary: We give a combinatorial description (including explicit differential-form bases) for the cohomology groups of the space of $n$ distinct nonzero complex numbers, with coefficients in rank-one local systems which are of finite monodromy around the coordinate hyperplanes and trivial monodromy around all other hyperplanes. In the case where the local system is equivariant for the symmetric group, we write the cohomology groups as direct sums of inductions of one-dimensional characters of subgroups. This relies on an equivariant description of the Orlik-Solomon algebras of full monomial reflection groups (wreath products of the symmetric group with a cyclic group). The combinatorial models involved are certain representations of these wreath products which possess bases indexed by labelled trees.
Keywords: keywords hyperplane complement, cohomology, representation, symmetric group 
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     author = {Henderson, Anthony},
     title = {Bases for certain cohomology representations of the symmetric group.},
     journal = {Journal of Algebraic Combinatorics},
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     url = {http://geodesic.mathdoc.fr/item/JAC_2006__24_4_a3/}
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Henderson, Anthony. Bases for certain cohomology representations of the symmetric group.. Journal of Algebraic Combinatorics, Tome 24 (2006) no. 4, pp. 361-390. http://geodesic.mathdoc.fr/item/JAC_2006__24_4_a3/