S. Tasaki et al., INTERIOR DIRICHLET EIGENVALUE PROBLEM, EXTERIOR NEUMANN SCATTERING PROBLEM, AND BOUNDARY-ELEMENT METHOD FOR QUANTUM BILLIARDS, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 56(1), 1997, pp. 13-16
An explicit expression for the Fredholm determinant D(E) appearing in
the boundary element method for two-dimensional quantum billiards is d
erived in terms of the interior Dirichlet eigenenergies and exterior N
eumann scattering phase shifts. Not only in the semiclassical regime b
ut also in ail order of (h) over bar, D(E) admits the factorization in
to the interior and exterior contributions, where the former has zeros
at interior Dirichlet eigenenergies and the latter at resonances of t
he Neumann scattering. A new aspect of the Kac's inverse problem is al
so discussed.