Operator interpretation of resonances arising in spectral problems for 2 x 2 operator matrices

R. Mennicken, A. K. Motovilov

We consider operator matrices {\bf H}= (A_0 B_{01} \\ B_{10} A_{1}) with self-adjoint entries A_i, i=0,1, and bounded B_{01}=B_{10}^*, acting in the orthogonal sum {\cal H}={\cal H…