English

Bulk universality for Wigner hermitian matrices with subexponential decay

Probability 2010-07-01 v2 Mathematical Physics math.MP

Abstract

We consider the ensemble of n×nn \times n Wigner hermitian matrices H=(hk)1,knH = (h_{\ell k})_{1 \leq \ell,k \leq n} that generalize the Gaussian unitary ensemble (GUE). The matrix elements hk=hˉkh_{k\ell} = \bar h_{\ell k} are given by hk=n1/2(xk+1yk)h_{\ell k} = n^{-1/2} (x_{\ell k} + \sqrt{-1} y_{\ell k}), where xk,ykx_{\ell k}, y_{\ell k} for 1<kn1 \leq \ell < k \leq n are i.i.d. random variables with mean zero and variance 1/2, y=0y_{\ell\ell}=0 and xx_{\ell \ell} have mean zero and variance 1. We assume the distribution of xk,ykx_{\ell k}, y_{\ell k} to have subexponential decay. In a recent paper, four of the authors recently established that the gap distribution and averaged kk-point correlation of these matrices were \emph{universal} (and in particular, agreed with those for GUE) assuming additional regularity hypotheses on the xk,ykx_{\ell k}, y_{\ell k}. In another recent paper, the other two authors, using a different method, established the same conclusion assuming instead some moment and support conditions on the xk,ykx_{\ell k}, y_{\ell k}. In this short note we observe that the arguments of these two papers can be combined to establish universality of the gap distribution and averaged kk-point correlations for all Wigner matrices (with subexponentially decaying entries), with no extra assumptions.

Keywords

Cite

@article{arxiv.0906.4400,
  title  = {Bulk universality for Wigner hermitian matrices with subexponential decay},
  author = {Laszlo Erdos and Jose Ramirez and Benjamin Schlein and Terence Tao and Van Vu and Horng-Tzer Yau},
  journal= {arXiv preprint arXiv:0906.4400},
  year   = {2010}
}

Comments

9 pages, no figures, submitted, Math. Res. Lett

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