Hypoelliptic Laplacian and Ray-Singer Metrics
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Hypoelliptic Laplacian and Ray-Singer Metrics by Jean-Michel Bismut
Book DescriptionThis book presents the analytic foundations to the theory of the hypoelliptic Laplacian. The hypoelliptic Laplacian, a second-order operator acting on the cotangent bundle of a compact manifold, is supposed to interpolate between the classical Laplacian and the geodesic flow. Jean-Michel Bismut and Gilles Lebeau establish the basic functional analytic properties of this operator, which is also studied from the perspective of local index theory and analytic torsion. The book shows that the hypoelliptic Laplacian provides a geometric version of the Fokker-Planck equations. The authors give the proper functional analytic setting in order to study this operator and develop a pseudodifferential calculus, which provides estimates on the hypoelliptic Laplacian's resolvent. When the deformation parameter tends to zero, the hypoelliptic Laplacian converges to the standard Hodge Laplacian of the base by a collapsing argument in which the fibers of the cotangent bundle collapse to a point. For the local index theory, small time asymptotics for the supertrace of the associated heat kernel are obtained. The Ray-Singer analytic torsion of the hypoelliptic Laplacian as well as the associated Ray-Singer metrics on the determinant of the cohomology are studied in an equivariant setting, resulting in a key comparison formula between the elliptic and hypoelliptic analytic torsions.
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Book DetailsISBN: 9780691137322
(229mm x 152mm x 19mm)
Imprint: Princeton University Press
Publisher: Princeton University Press
Publish Date: 18-Aug-2008
Country of Publication: United States
Books By Author Jean-Michel Bismut
Hypoelliptic Laplacian and Orbital Integrals, Paperback (August 2011)» View all books by Jean-Michel Bismut
The hypoelliptic Laplacian is a family of operators that is supposed to interpolate between the ordinary Laplacian and the geodesic flow. This book uses the hypoelliptic Laplacian to evaluate semisimple orbital integrals in a formalism that unifies index theory and the trace formula.
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Author Biography - Jean-Michel Bismut
Jean-Michel Bismut is professor of mathematics at the University of Paris-Sud. Gilles Lebeau is professor of mathematics at the University of Nice Sophia-Antipolis.
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