Two-body threshold spectral analysis, the critical case

We study in dimension $d\geq2$ low-energy spectral and scattering asymptotics for two-body $d$-dimensional Schrödinger operators with a radially symmetric potential falling off like $-γr^{-2},\;γ>0$. We consider angular momentum sectors, labelled by $l=0,1,\dots$, for which $γ>(l+d/2-1)^2$. In each such sector the reduced Schrödinger operator has infinitely many negative eigenvalues accumulating at zero. We show that the resolvent has a non-trivial oscillatory behaviour as the spectral parameter approaches zero in cones bounded away from the negative half-axis, and we derive an asymptotic formula for the phase shift.

No reviews yet.

No comments yet.