E. Caliceti(*), F. Cannata(**), S. Graffi(*)
Perturbation theory of PT-symmetric Hamiltonians
(34K, LaTeX 2e)

ABSTRACT.  In the framework of perturbation theory the reality of the perturbed eigenvalues of a class of $\PT$symmetric Hamiltonians is proved using stability techniques. We apply this method to $\PT$symmetric unperturbed Hamiltonians perturbed by $\PT$symmetric additional interactions.