DURUGO, S.O. and LORINCZI, J., 2018. Spectral properties of the massless relativistic quartic oscillator. Journal of Differential Equations, 264 (5), pp. 3775-3809.
An explicit solution of the spectral problem of the non-local Schrodinger operator obtained as the sum of the square root of the Laplacian and a quartic potential in
one dimension is presented. The eigenvalues are obtained as zeroes of special functions re-
lated to the fourth order Airy function, and closed formulae for the Fourier transform of the
eigenfunctions are derived. These representations allow to derive further spectral properties
such as estimates of spectral gaps, heat trace and the asymptotic distribution of eigenvalues, as well as a detailed analysis of the eigenfunctions. A subtle spectral effect is observed
which manifests in an exponentially tight approximation of the spectrum by the zeroes of
the dominating term in the Fourier representation of the eigenfunctions and its derivative.
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