Shell interactions for Dirac operators. (English) Zbl 1297.81083
Summary: The self-adjointness of \(H + V\) is studied, where \(H = - i \alpha \cdot \nabla + m \beta\) is the free Dirac operator in \(\mathbb{R}^3\) and \(V\) is a measure-valued potential. The potentials \(V\) under consideration are given by singular measures with respect to the Lebesgue measure, with special attention to surface measures of bounded regular domains. The existence of non-trivial eigenfunctions with zero eigenvalue naturally appears in our approach, which is based on well known estimates for the trace operator defined on classical Sobolev spaces and some algebraic identities of the Cauchy operator associated to \(H\).
MSC:
| 81Q10 | Selfadjoint operator theory in quantum theory, including spectral analysis |
| 35Q40 | PDEs in connection with quantum mechanics |
| 47B25 | Linear symmetric and selfadjoint operators (unbounded) |
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