The 2-Transitive Transplantable Isospectral Drums

Details The 2-Transitive Transplantable Isospectral Drums The 2-Transitive Transplantable Isospectral Drums

2011-08-18

arxiv.org/abs/1108.3650v1

SIGMA 7 (2011), 080, 8 pages

Physics

Mathematical Physics

Scientific paper

10.3842/SIGMA.2011.080

For Riemannian manifolds there are several examples which are isospectral but not isometric, see e.g. J. Milnor [Proc. Nat. Acad. Sci. USA 51 (1964), 542]; in the present paper, we investigate pairs of domains in ${\mathbb R}^2$ which are isospectral but not congruent. All known such counter examples to M. Kac's famous question can be constructed by a certain tiling method ("transplantability") using special linear operator groups which act 2-transitively on certain associated modules. In this paper we prove that if any operator group acts 2-transitively on the associated module, no new counter examples can occur. In fact, the main result is a corollary of a result on Schreier coset graphs of 2-transitive groups.

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