Abstract
For a compact spin manifold M isometrically embedded into Euclidean space, we derive the extrinsic estimates from above and below for eigenvalues of the square of the Dirac operator, which depend on the second fundamental form of the embedding. We also show the bounds of the ratio of the eigenvalues. Since the unit sphere and the projective spaces admit the standard embedding into Euclidean spaces, we also obtain the corresponding results for their compact spin submanifolds.
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Chen, D. Extrinsic estimates for eigenvalues of the Dirac operator. Math. Z. 262, 349–361 (2009). https://doi.org/10.1007/s00209-008-0376-8
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DOI: https://doi.org/10.1007/s00209-008-0376-8