Eigenvalue Estimates for the Weighted Laplacian on Metric Trees
2000
The Laplacian on a metric tree is on its edges, with the appropriate compatibility conditions at the vertices. We study the eigenvalue problem on a rooted tree : -\lambda \Delta u = V u \quad \text{on } \Gamma,
\qquad u(o)=0.
Here , and . The eigenvalues for such a problem decay no faster than , this last case being typical for one-dimensional problems. We obtain estimates for the eigenvalues in the classes , and their weak analogues . The results for are of different character. The case is studied in more detail. To analyse this case, we use two methods; in both of them the problem is
reduced to a family of one-dimensional problems. One of the methods is based upon a useful orthogonal decomposition
of the Dirichlet space on . For a particular class of trees and weights, this method leads to the complete spectral analysis of the problem. We illustrate this in several examples, where we were able to obtain the asymptotics of the eigenvalues. 1991 Mathematics Subject Classification: primary 47E05, 05C05;
secondary 34L15, 34L20.
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