Codazzi tensors and reducible submanifolds
Author:
Irl Bivens
Journal:
Trans. Amer. Math. Soc. 268 (1981), 231246
MSC:
Primary 53C40
MathSciNet review:
628456
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Abstract: An integral formula is derived for Codazzi tensors of type . Many of the classical Minkowski type integral formulas then become special cases of this one. If is a submanifold of Euclidean space and is a parallel distribution on then each leaf of is a submanifold of Euclidean space with mean curvature normal vector field . Using the above integral formula we show that the integral of over is bounded below by an intrinsic constant and we give necessary and sufficient conditions for equality to hold. The reducible surfaces for which equality holds are characterized and related results concerned with Riemannian product manifolds are proved. Parallel tensors of type are characterized in terms of the de Rham decomposition. It is shown that if is irreducible and is a parallel tensor of type on which is not multiplication by a constant then is a Kaehler manifold. Some further results are derived for manifolds whose simply connected cover is Kaehler.
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DOI:
http://dx.doi.org/10.1090/S00029947198106284562
PII:
S 00029947(1981)06284562
Article copyright:
© Copyright 1981
American Mathematical Society
