Quantitative spectral stability for Aharonov–Bohm operators with many coalescing poles

  • Veronica Felli

    Università degli Studi di Milano-Bicocca, Milano, Italy
  • Benedetta Noris

    Politecnico di Milano, Milano, Italy
  • Roberto Ognibene

    Università di Pisa, Pisa, Italy
  • Giovanni Siclari

    Politecnico di Milano, Milano, Italy
Quantitative spectral stability for Aharonov–Bohm operators with many coalescing poles cover
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Abstract

The behaviour of simple eigenvalues of Aharonov–Bohm operators with many coalescing poles is discussed. In the case of half-integer circulation, a gauge transformation makes the problem equivalent to an eigenvalue problem for the Laplacian in a domain with straight cracks, lying along the moving directions of poles. For this problem, we obtain an asymptotic expansion for eigenvalues, in which the dominant term is related to the minimum of an energy functional associated with the configuration of poles and defined on a space of functions suitably jumping through the cracks.
Concerning configurations with an odd number of poles, an accurate blow-up analysis identifies the exact asymptotic behaviour of eigenvalues and the sign of the variation in some cases. An application to the special case of two poles is also discussed.

Cite this article

Veronica Felli, Benedetta Noris, Roberto Ognibene, Giovanni Siclari, Quantitative spectral stability for Aharonov–Bohm operators with many coalescing poles. J. Eur. Math. Soc. (2025), published online first

DOI 10.4171/JEMS/1632