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## Asymptotics of the Hartree operator spectrum near the upper boundaries of spectral clusters: Asymptotic solutions localized near a circle

Theoretical and Mathematical Physics. 2015. Vol. 183. No. 1. P. 516-526.

We consider the eigenvalue problem for the Hartree operator with a small parameter multiplying the

nonlinearity. We obtain asymptotic eigenvalues and asymptotic eigenfunctions near the upper boundaries

of spectral clusters formed near the energy levels of the unperturbed operator. Near the circle where

the solution is localized, the leading term of the expansion is a solution of the two-dimensional oscillator problem.