Spectral properties of the Dirac operator with a nonsmooth potential of the general form and operator groups (Q2009917)

The purpose of this article is to study a Dirac operator \(L\) between Hilbert spaces. The main result is a complicated similarity theorem about the existence of an integer \(k>0\) with certain properties. Then the spectrum \(\sigma(L)\) is represented in the form of a union. Finally, it is shown that the operator \(iL\) is the generator of a strongly continuous operator group.