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We establish a large deviation principle for the largest eigenvalue of a rank one defor- mation of a matrix from the GUE or GOE. As a corollary, we get another proof of the phenomenon, well-known in learning theory and finance, that the largest eigenvalue separates from the bulk when the perturbation is large enough. A large part of the paper is devoted to an auxiliary result on the continuity of spherical integrals in the case when one of the matrix is of rank one, as studied in (9).

Large deviations for the largest eigenvalue of rank one deformations of Gaussian ensembles