info:eu-repo/semantics/article
Spectral properties of Levy matrices
Autor
Araujo, Mariela
Medina, Ernesto
Institución
Resumen
The statistical properties of the spectrum from large symmetric matrices are investigated. In these matrices the elements are chosen from a power-law distribution p(x) = اνاx ν−1 with −2 ≤ ν ≤ 1. Universality classes or stable laws are explored by studying the density of states ρ(E) and the distribution of eigenvalue spacings P(s). Various regimes could be identified as a function of the disorder strength parameter ν. For 0 < ν < 1, the density of states obeys the simple semicircular law, and P(s) follows the Wigner surmise. For ν < 0, various zones separated by energy-dependent boundaries are observed. Furthermore, in the limit ν→ 0, we find a density of states that corresponds to the sparse matrix limit, with the characteristic singularity ρ(E) 1/E . However, in this limit the spacing distribution exhibits power laws tails instead of the well known Brody form.