Multiplicity-free representations of symmetric groups

Details Multiplicity-free representations of symmetric groups Multiplicity-free representations of symmetric groups

2009-03-16

arxiv.org/abs/0903.2864v1

Mathematics

Representation Theory

23 pages, 4 figures

Scientific paper

Building on work of Saxl, we classify the multiplicity-free permutation characters of all symmetric groups of degree 66 or more. A corollary is a complete list of the irreducible characters of symmetric groups (again of degree 66 or more) which may appear in a multiplicity-free permutation representation. The multiplicity-free characters in a related family of monomial characters are also classified. We end by investigating a consequence of these results for Specht filtrations of permutation modules defined over fields of prime characteristic. Remark: parallel work of Godsil and Meagher (arXiv:math/0612567) gives an independent classification of the multiplicity-free permutation characters of symmetric groups of all degrees.

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