Mathematics – Spectral Theory
Scientific paper
2005-11-14
Canad. Math. Bull. 51 (2008), no. 2, 249--260
Mathematics
Spectral Theory
Reference added, slight change in estimate in theorem 1, remark on the new proof in dim two added, to appear in Canad. Math. B
Scientific paper
Let M be a closed Riemannian manifold. We consider the inner radius of a nodal domain for a large eigenvalue \lambda. We give upper and lower bounds on the inner radius of the type C/\lambda^k. Our proof is based on a local behavior of eigenfunctions discovered by Donnelly and Fefferman, and a Poincar\'e type inequality proved by Maz'ya. Sharp lower bounds are known only in dimension two. We give an account of this case too.
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