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Multicanonical sampling of rare events in random matrices
Nen Saito1, Yukito Iba, Koji Hukushima
1Graduate School of Science and Cybermedia Center, Osaka University, Toyonaka, Osaka 560-0043, Japan. saito@cp.cmc.osaka-u.ac.jp
Abstract:
A method based on multicanonical Monte Carlo is applied to the calculation of large deviations in the largest eigenvalue of random matrices. The method is successfully tested with the Gaussian orthogonal ensemble, sparse random matrices, and matrices whose components are subject to uniform density. Specifically, the probability that all eigenvalues of a matrix are negative is estimated in these cases down to the values of ∼10(-200), a region where simple random sampling is ineffective. The method can be applied to any ensemble of matrices and used for sampling rare events characterized by any statistics.
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