Abstract
We give a description of the essential spectra of unbounded operators ℋ q on L2(Γ) determined by the Schrodinger operators −d2/dx2 + q(x) on the edges of Γ and general vertex conditions. We introduce a set of limit operators of ℋ q such that the essential spectrum of ℋ q is the union of the spectra of limit operators. We apply this result to describe the essential spectra of the operators ℋ q with periodic potentials perturbed by terms slowly oscillating at infinity.
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