The hypoelliptic Laplacian on the cotangent bundle

Bismut, Jean-Michel

doi:10.1090/S0894-0347-05-00479-0

The hypoelliptic Laplacian on the cotangent bundle
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by Jean-Michel Bismut

J. Amer. Math. Soc. 18 (2005), 379-476

DOI: https://doi.org/10.1090/S0894-0347-05-00479-0

Published electronically: February 28, 2005

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Abstract:

In this paper, we construct a new version of Hodge theory, where the corresponding Laplacian acts on the total space of the cotangent bundle. This Laplacian is a hypoelliptic operator, which is in general non-self-adjoint. When properly interpreted, it provides an interpolation between classical Hodge theory and the generator of the geodesic flow. The construction is also done in families in the superconnection formalism of Quillen and extends earlier work by Lott and the author.

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