Eigenvalue bounds for Schr\"odinger operators with complex potentials. II

Abstract

Laptev and Safronov conjectured that any non-positive eigenvalue of a Schr\"odinger operator $-\Delta+V$ in $L^2(\mathbb R^\nu)$ with complex potential has absolute value at most a constant times $\|V\|_{\gamma+\nu/2}^{(\gamma+\nu/2)/\gamma}$ for $0<\gamma\leq\nu/2$ in dimension $\nu\geq 2$. We prove this conjecture for radial potentials if $0<\gamma<\nu/2$ and we `almost disprove' it for general potentials if $1/2<\gamma<\nu/2$. In addition, we prove various bounds that hold, in particular, for positive eigenvalues.