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We first establish a sharp relation between the order of vanishing of a Dirichlet eigenfunction at a point and the leading term of the asymptotic expansion of the Dirichlet eigenvalue variation, as a removed compact set concentrates at that point. Then we apply this spectral stability result to the study of the asymptotic behaviour of eigenvalues of Aharonov–Bohm operators with two colliding poles moving on an axis of symmetry of the domain.
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Laura Abatangelo, Veronica Felli, Luc Hillairet, Corentin Léna, Spectral stability under removal of small capacity sets and applications to Aharonov–Bohm operators. J. Spectr. Theory 9 (2018), no. 2, pp. 379–427