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This text examines the Atiyah-Singer theorem using the heat
equation, which gives a local formula for the index of any elliptic
complex. Heat equation methods are also used to discuss Lefschetz
fixed point formulas, the Gauss-Bonnet theorem for a manifold with
smooth boundary, and the geometrical theorem for a manifold with
smooth boundary. The book presents a careful treatment of
non-self-adjoint operators, asymptotics of the heat equation and
variational formulas. It also introduces spectral geometry and
provides a list of asymptotic formulas. The bibliography has been
complied by Herbert Schroeder.
Recently a great deal of progress has been made in the field of
asymptotic formulas that arise in the theory of the operators Dirac
and Laplace. These include not only the classical heat trace
asymptotics and heat content asymptotics, but the more exotic
objects working in the context of manifolds with boundary and
imposing suitable boundary conditions. Asymptotic Formulae in
Spectral Geometry focuses on the interplay between geometry
(invariance theory), partial differential equations, mathematical
physics and the combinatorial underpinnings. The formulas studied
are important not only for their intrinsic interest, but because
they can be applied to index theory, the zeta function
regularization, and more.
This volume focuses on discussing the interplay between the
analysis, as exemplified by the eta invariant and other spectral
invariants, the number theory, as exemplified by the relevant
Dedekind sums and Rademacher reciprocity, the algebraic topology,
as exemplified by the equivariant bordism groups, K-theory groups,
and connective K-theory groups, and the geometry of spherical space
forms, as exemplified by the Smith homomorphism. These are used to
study the existence of metrics of positive scalar curvature on spin
manifolds of dimension at least 5 whose fundamental group is a
spherical space form group.This volume is a completely rewritten
revision of the first edition. The underlying organization is
modified to provide a better organized and more coherent treatment
of the material involved. In addition, approximately 100 pages have
been added to study the existence of metrics of positive scalar
curvature on spin manifolds of dimension at least 5 whose
fundamental group is a spherical space form group. We have chosen
to focus on the geometric aspect of the theory rather than more
abstract algebraic constructions (like the assembly map) and to
restrict our attention to spherical space forms rather than more
general and more complicated geometrical examples to avoid losing
contact with the fundamental geometry which is involved.
A central area of study in Differential Geometry is the examination
of the relationship between the purely algebraic properties of the
Riemann curvature tensor and the underlying geometric properties of
the manifold. In this book, the findings of numerous investigations
in this field of study are reviewed and presented in a clear,
coherent form, including the latest developments and proofs. Even
though many authors have worked in this area in recent years, many
fundamental questions still remain unanswered. Many studies begin
by first working purely algebraically and then later progressing
onto the geometric setting and it has been found that many
questions in differential geometry can be phrased as problems
involving the geometric realization of curvature. Curvature
decompositions are central to all investigations in this area. The
authors present numerous results including the Singer-Thorpe
decomposition, the Bokan decomposition, the Nikcevic decomposition,
the Tricerri-Vanhecke decomposition, the Gray-Hervella
decomposition and the De Smedt decomposition. They then proceed to
draw appropriate geometric conclusions from these
decompositions.The book organizes, in one coherent volume, the
results of research completed by many different investigators over
the past 30 years. Complete proofs are given of results that are
often only outlined in the original publications. Whereas the
original results are usually in the positive definite (Riemannian
setting), here the authors extend the results to the
pseudo-Riemannian setting and then further, in a complex framework,
to para-Hermitian geometry as well. In addition to that, new
results are obtained as well, making this an ideal text for anyone
wishing to further their knowledge of the science of curvature.
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