On the spectral properties of the Hilbert transform operator on multi-intervals
On the spectral properties of the Hilbert transform operator on multi-intervals
Let J,E\subset\mathbb{R} be two multi-intervals with non-intersecting interiors. Consider the operator A\colon L^2( J )\to L^2(E),\quad (Af)(x) = \frac 1\pi\int_J \frac {f(y) d y}{{y-x}}, and let A^\dagger be its adjoint. We introduce a self-adjoint operator \mathscr K acting on L^2(E)\oplus L^2(J) , whose off-diagonal blocks consist of A and A^\dagger …