The globally irreducible representations of symmetric groups
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- by Alexander Kleshchev and Alexander Premet PDF
- Proc. Amer. Math. Soc. 128 (2000), 647-655 Request permission
Abstract:
Let $K$ be an algebraic number field and $\mathcal {O}$ be the ring of integers of $K$. Let $G$ be a finite group and $M$ be a finitely generated torsion free $\mathcal {O} G$-module. We say that $M$ is a globally irreducible $\mathcal {O} G$-module if, for every maximal ideal $\mathfrak {p}$ of $\mathcal {O}$, the $k_\mathfrak {p} G$-module $M\otimes _{ \mathcal {O}} k_\mathfrak {p}$ is irreducible, where $k_\mathfrak {p}$ stands for the residue field $\mathcal {O}/\mathfrak {p}$. Answering a question of Pham Huu Tiep, we prove that the symmetric group $\Sigma _n$ does not have non-trivial globally irreducible modules. More precisely we establish that if $M$ is a globally irreducible $\mathcal {O} \Sigma _n$-module, then $M$ is an $\mathcal {O}$-module of rank $1$ with the trivial or sign action of $\Sigma _n$.References
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Additional Information
- Alexander Kleshchev
- Affiliation: Department of Mathematics, University of Oregon, Eugene, Oregon 97403
- MR Author ID: 268538
- Email: klesh@math.uoregon.edu
- Alexander Premet
- Affiliation: Department of Mathematics, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
- MR Author ID: 190461
- Email: sashap@ma.man.ac.uk
- Received by editor(s): December 10, 1997
- Received by editor(s) in revised form: April 15, 1998
- Published electronically: July 27, 1999
- Additional Notes: The authors thank G. Michler and A. Zalesskii who organized a conference on representations of finite groups in Bad-Honnef where this collaboration began, and the Volkswagen foundation for financial support. The first author was also supported by the NSF
- Communicated by: Ronald M. Solomon
- © Copyright 1999 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 128 (2000), 647-655
- MSC (1991): Primary 20C30, 20C10
- DOI: https://doi.org/10.1090/S0002-9939-99-05418-0
- MathSciNet review: 1676332