Can one count the shape of a drum?

Details Can one count the shape of a drum? Can one count the shape of a drum?

2006-06-19

arxiv.org/abs/nlin/0606050v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.97.090201

Sequences of nodal counts store information on the geometry (metric) of the domain where the wave equation is considered. To demonstrate this statement, we consider the eigenfunctions of the Laplace-Beltrami operator on surfaces of revolution. Arranging the wave functions by increasing values of the eigenvalues, and counting the number of their nodal domains, we obtain the nodal sequence whose properties we study. This sequence is expressed as a trace formula, which consists of 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 content of the nodal sequence is thus explicitly revealed.

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