Gaussian fluctuations for linear statistics of Wigner matrices

Stochastics Seminar
Thursday, October 1, 2015 - 15:05
1 hour (actually 50 minutes)
Skiles 006
Harvard University
In the 1970s, Girko made the striking observation that, after centering, traces of functions of large random matrices have approximately Gaussian distribution. This convergence is true without any further normalization provided f is smooth enough, even though the trace involves a number of terms equal to the dimension of the matrix. This is particularly interesting, because for some rougher, but still natural observables, like the number of eigenvalues in an interval, the fluctuations diverge. I will explain how such results can be obtained, focusing in particular on controlling the fluctuations when the function is not very regular.