On the Spectral Asymptotics of Operators on Manifolds with Ends

الملخص EN

We deal with the asymptotic behaviour, for λ→+∞, of the counting function NP(λ) of certain positive self-adjoint operators P with double order (m,μ), m,μ > 0, m≠μ , defined on a manifold with ends M.

The structure of this class of noncompact manifolds allows to make use of calculi of pseudodifferential operators and Fourier integral operators associated with weighted symbols globally defined on ℝn.

By means of these tools, we improve known results concerning the remainder terms of the Weyl Formulae for NP(λ) and show how their behaviour depends on the ratio m/μ and the dimension of M.