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The Jordan normal form of higher order Osserman algebraic curvature tensors

Peter GilkeyRaina Ivanova — 2002

Commentationes Mathematicae Universitatis Carolinae

We construct new examples of algebraic curvature tensors so that the Jordan normal form of the higher order Jacobi operator is constant on the Grassmannian of subspaces of type ( r , s ) in a vector space of signature ( p , q ) . We then use these examples to establish some results concerning higher order Osserman and higher order Jordan Osserman algebraic curvature tensors.

The local index density of the perturbed de Rham complex

Jesús Álvarez LópezPeter B. Gilkey — 2021

Czechoslovak Mathematical Journal

A perturbation of the de Rham complex was introduced by Witten for an exact 1-form Θ and later extended by Novikov for a closed 1-form on a Riemannian manifold M . We use invariance theory to show that the perturbed index density is independent of Θ ; this result was established previously by J. A. Álvarez López, Y. A. Kordyukov and E. Leichtnam (2020) using other methods. We also show the higher order heat trace asymptotics of the perturbed de Rham complex exhibit nontrivial dependence on Θ . We establish...

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