Anomalous singularity of the solution of the vector Dyson equation in the critical case

Abstract

We consider the solution of the vector Dyson equation $-1/m=z+Sm$ in the case when $S$ has a block staircase structure with $(n-1)$ different critical zero blocks below the strictly positive anti-diagonal and all elements right above the anti-diagonal are strictly positive. We prove that the components of $m$ behave as fractional powers of $z$ in the neighbourhood of zero and show that the self-consistent density of states $\rho (E)$ behaves as $|E{|}^{-\frac{n-1}{n+1}}$ as $E$ tends to zero, where $n^2$ is a number of blocks. Both constant block and non-constant block cases are considered. In the non-constant case uniform estimates for the components of $m$ are obtained.

30 pages

References in corpus (2)

• Quadratic vector equations on complex upper half-plane
• Singularity degree of structured random matrices