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On the Spectrum of an n! × n! Matrix Originating from Statistical Mechanics

Published online by Cambridge University Press:  20 November 2018

Dominique Chassé
Affiliation:
Département de physique, Université de Montréal, Montréal, QC, H3C 3J7 e-mail: Dominique.Chasse@USherbrooke.ca
Yvan Saint-Aubin
Affiliation:
Département de mathématiques et de statistique, Université de Montréal, Montréal, Québec, H3C 3J7 e-mail: saint@dms.umontreal.ca
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Abstract

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Let ${{R}_{n}}\left( \alpha \right)$ be the $n!\,\times \,n!$ matrix whose matrix elements ${{\left[ {{R}_{n}}\left( \alpha \right) \right]}_{\sigma p}}$ , with $\sigma$ and $p$ in the symmetric group ${{G}_{n}}$ , are ${{\alpha }^{\ell \left( \sigma {{p}^{-1}} \right)}}$ with $0\,<\,\alpha \,<\,1$, where $\ell \left( \text{ }\!\!\pi\!\!\text{ } \right)$ denotes the number of cycles in $\text{ }\pi \text{ }\in {{G}_{n}}.$ We give the spectrum of ${{R}_{n}}$ and show that the ratio of the largest eigenvalue ${{\text{ }\!\!\lambda\!\!\text{ }}_{0}}$ to the second largest one (in absolute value) increases as a positive power of $n$ as $n\,\to \,\infty$.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 2009

References

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