Cavity approach to the spectral density of sparse symmetric random matrices.
The spectral density of various ensembles of sparse symmetric random matrices is analyzed using the cavity method. We consider two cases: matrices whose associated graphs are locally treelike, and sparse covariance matrices. We derive a closed set of equations from which the density of eigenvalues can be efficiently calculated. Within this approach, the Wigner semicircle law for Gaussian matrices and the Marcenko-Pastur law for covariance matrices are recovered easily. Our results are compared with numerical diagonalization, showing excellent agreement.
Department of Mathematics, King's College London, Strand, London WC2R 2LS, United Kingdom.
Tim
T
Rogers
Isaac Pérez
IP
Castillo
Reimer
R
Kühn
Koujin
K
Takeda