The birth of a cut in unitary random matrix ensembles

Details The birth of a cut in unitary random matrix ensembles The birth of a cut in unitary random matrix ensembles

2007-11-16

arxiv.org/abs/0711.2609v1

Physics

Mathematical Physics

28 pages, 2 figures

Scientific paper

We study unitary random matrix ensembles in the critical regime where a new cut arises away from the original spectrum. We perform a double scaling limit where the size of the matrices tends to infinity, but in such a way that only a bounded number of eigenvalues is expected in the newborn cut. It turns out that limits of the eigenvalue correlation kernel are given by Hermite kernels corresponding to a finite size Gaussian Unitary Ensemble (GUE). When modifying the double scaling limit slightly, we observe a remarkable transition each time the new cut picks up an additional eigenvalue, leading to a limiting kernel interpolating between GUE-kernels for matrices of size k and size k+1. We prove our results using the Riemann-Hilbert approach.

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