Asymptotic independence in the spectrum of the Gaussian unitary ensemble

Pascal Bianchi (1) , Merouane Debbah (1) , Jamal Najim (2)

1 E3S - Supélec Sciences des Systèmes
2 LTCI - Laboratoire Traitement et Communication de l'Information

Consider a n × n matrix from the Gaussian Unitary Ensemble (GUE). Given a finite collection of bounded disjoint real Borel sets (∆i,n, 1 ≤ i ≤ p), properly rescaled, and eventually included in any neighbourhood of the support of Wigner's semi-circle law, we prove that the related counting measures (Nn(∆i,n), 1 ≤ i ≤ p), where Nn(∆) represents the number of eigenvalues within ∆, are asymptotically independent as the size n goes to infinity, p being fixed. As a consequence, we prove that the largest and smallest eigenvalues, properly centered and rescaled, are asymptotically independent ; we finally describe the fluctuations of the condition number of a matrix from the GUE.

Domains: Networking and Internet Architecture [cs.NI]

Pascal Bianchi, Merouane Debbah, Jamal Najim. Asymptotic independence in the spectrum of the Gaussian unitary ensemble. Electronic Communications in Probability, 2010, 15 (Paper 35), pp.376-395. ⟨hal-00556126⟩