Abstract.
The sequence of nodal count is considered for separable drums. A recently derived trace formula for this sequence stores geometrical information of the drum. This statement is demonstrated in detail for the Laplace-Beltrami operator on simple tori and surfaces of revolution. The trace formula expresses the cumulative sum of nodal counts This sequence is expressed as a sum of two parts: a smooth (Weyl like) part which depends on global geometrical parameters, and a fluctuating part which involves the classical periodic orbits on the torus and their actions (lengths). The geometrical context of the nodal sequence is thus explicitly revealed.
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Gnutzmann, S., Karageorge, P. & Smilansky, U. A trace formula for the nodal count sequence. Eur. Phys. J. Spec. Top. 145, 217–229 (2007). https://doi.org/10.1140/epjst/e2007-00158-y
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DOI: https://doi.org/10.1140/epjst/e2007-00158-y