math/0601180Jan 9, 20067 Pages, written in Latex. Revised version of the paper "Curvature free lower bounds for the first eigenvalue of normal geodesic balls"
Lower bounds for the first Laplacian eigenvalue of geodesic balls of spherically symmetric manifolds
Gregorio Pacelli Bessa, Cleon S. Barroso
Abstract
We obtain lower bounds for the first Laplacian eigenvalues of geodesic balls of spherically symmetric manifolds. These lower bounds are only C0 dependent on the metric coefficients.