Abstract
A weighted Laplace-Beltrami operator on a Riemannian manifold M is an operator of the form
where σ is a positive, locally bounded function defined on M. We obtain upper and lower bounds on the eigenvalue counting function of H for a class of incomplete manifolds with locally bounded geometry and for certain weights σ. Our method relies upon Dirichlet-Neumann bracketing and so no smoothness assumption on the metric or on σ is needed. Our results apply, in particular, to the Dirichlet Laplacian on unbounded domains in Rn satisfying Hardy’s inequality and to certain elliptic operators with degenerate coefficients.
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Lianantonakis, M. On the eigenvalue counting function for weighted Laplace-Beltrami operators. J Geom Anal 10, 299–322 (2000). https://doi.org/10.1007/BF02921827
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DOI: https://doi.org/10.1007/BF02921827