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• W3211583352 abstract "We consider the two-dimensional Dirac operator with Lorentz-scalar $$delta $$ -shell interactions on each edge of a star graph. An orthogonal decomposition is performed which shows such an operator is unitarily equivalent to an orthogonal sum of half-line Dirac operators with off-diagonal Coulomb potentials. This decomposition reduces the computation of the deficiency indices to determining the number of eigenvalues of a one-dimensional spin–orbit operator in the interval $$(-1/2,1/2)$$ . If the number of edges of the star graph is two or three, these deficiency indices can then be analytically determined for a range of parameters. For higher numbers of edges, it is possible to numerically calculate the deficiency indices. Among others, examples are given where the strength of the Lorentz-scalar interactions directly change the deficiency indices, while other parameters are all fixed and where the deficiency indices are (2, 2), neither of which have been observed in the literature to the best knowledge of the authors. For those Dirac operators which are not already self-adjoint and do not have 0 in the spectrum of the associated spin–orbit operator, the distinguished self-adjoint extension is also characterized." @default.
• W3211583352 created "2021-11-22" @default.
• W3211583352 creator A5015673447 @default.
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• W3211583352 date "2022-07-04" @default.
• W3211583352 modified "2023-10-05" @default.
• W3211583352 title "Self-adjointness of the 2D Dirac Operator with Singular Interactions Supported on Star Graphs" @default.
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• W3211583352 doi "https://doi.org/10.1007/s00023-022-01213-w" @default.
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