
Consider the symmetric group $S_n$ acting as a reflection group on the polynomial ring $k[x_1, \ldots, x_n]$, where $k$ is a field such that Char$(k)$ does not divide $n!$. We use Higher Specht polynomials to construct matrix factorizations of the discriminant of this group action: these matrix factorizations are indexed by partitions of $n$ and respect the decomposition of the coinvariant algebra into isotypical components. The maximal Cohen-Macaulay modules associated to these matrix factorizations give rise to a noncommutative resolution of the discriminant and they correspond to the nontrivial irreducible representations of $S_n$. All our constructions are implemented in Macaulay2 and we provide several examples. We also discuss extensions of these results to Young subgroups of $S_n$.
23 pages, comments welcome!
Matrix factorizations, Maximal Cohen–Macaulay modules, Discriminants of reflection groups, maximal Cohen-Macaulay modules, Cohen-Macaulay modules, Reflection groups, reflection geometries, matrix factorizations, Higher Specht polynomials, Representations of finite symmetric groups, Mathematics - Rings and Algebras, Computational methods for problems pertaining to group theory, Mathematics - Commutative Algebra, Commutative Algebra (math.AC), 13C14, 05E10, 20F55, 20C30, Mathematics - Algebraic Geometry, Reflection and Coxeter groups (group-theoretic aspects), Rings and Algebras (math.RA), Combinatorial aspects of representation theory, FOS: Mathematics, Representation Theory (math.RT), discriminants of reflection groups, Algebraic Geometry (math.AG), Mathematics - Representation Theory, higher Specht polynomials
Matrix factorizations, Maximal Cohen–Macaulay modules, Discriminants of reflection groups, maximal Cohen-Macaulay modules, Cohen-Macaulay modules, Reflection groups, reflection geometries, matrix factorizations, Higher Specht polynomials, Representations of finite symmetric groups, Mathematics - Rings and Algebras, Computational methods for problems pertaining to group theory, Mathematics - Commutative Algebra, Commutative Algebra (math.AC), 13C14, 05E10, 20F55, 20C30, Mathematics - Algebraic Geometry, Reflection and Coxeter groups (group-theoretic aspects), Rings and Algebras (math.RA), Combinatorial aspects of representation theory, FOS: Mathematics, Representation Theory (math.RT), discriminants of reflection groups, Algebraic Geometry (math.AG), Mathematics - Representation Theory, higher Specht polynomials
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