Mathematics – Spectral Theory
Scientific paper
2010-10-13
Journal of Spectral Theory 1 (2011), no. 1, 87-109
Mathematics
Spectral Theory
18 pages, 1 figure
Scientific paper
We study the eigenvalues of the Dirichlet Laplace operator on an arbitrary bounded, open set in $\R^d$, $d \geq 2$. In particular, we derive upper bounds on Riesz means of order $\sigma \geq 3/2$, that improve the sharp Berezin inequality by a negative second term. This remainder term depends on geometric properties of the boundary of the set and reflects the correct order of growth in the semi-classical limit. Under certain geometric conditions these results imply new lower bounds on individual eigenvalues, which improve the Li-Yau inequality.
Geisinger Leander
Laptev Ari
Weidl Timo
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