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- W2892301319 abstract "This paper is concerned with the maximisation of the k'th eigenvalue of the Laplacian amongst flat tori of unit volume in dimension d as k goes to infinity. We show that in any dimension maximisers exist for any given k, but that any sequence of maximisers degenerates as k goes to infinity when the dimension is at most 10. Furthermore, we obtain specific upper and lower bounds for the injectivity radius of any sequence of maximisers. We also prove that flat Klein bottles maximising the k'th eigenvalue of the Laplacian exhibit the same behaviour. These results contrast with those obtained recently by Gittins and Larson, stating that sequences of optimal cuboids for either Dirichlet or Neumann boundary conditions converge to the cube no matter the dimension. We obtain these results via Weyl asymptotics with explicit control of the remainder in terms of the injectivity radius. We reduce the problem at hand to counting lattice points inside anisotropically expanding domains, where we generalise methods of Yu. Kordyukov and A. Yakovlev by considering domains that expand at different rates in various directions." @default.
- W2892301319 created "2018-09-27" @default.
- W2892301319 creator A5016509290 @default.
- W2892301319 date "2018-09-05" @default.
- W2892301319 modified "2023-09-29" @default.
- W2892301319 title "Eigenvalue optimisation on flat tori and lattice points in anisotropically expanding domains" @default.
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- W2892301319 hasPublicationYear "2018" @default.
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