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We give a systematic treatment of index theory on Pin manifolds, based on the Clifford linear Dirac operator and differential KO-theory. This expository article is based on joint work with Mike Hopkins.

Differential Geometry · Mathematics 2024-07-26 Daniel S. Freed

We extend the groundbreaking results of Gromov and Lawson on positive scalar curvature and the Dirac operator on complete Riemannian manifolds to Dirac operators defined along the leaves of foliations of non-compact complete Riemannian…

Differential Geometry · Mathematics 2022-10-26 Moulay Tahar Benameur , James L. Heitsch

For closed manifolds endowed with a Riemannian foliation of codimension $4$, one can define a transversal Seiberg-Witten map. We show that there is a finite dimensional approximation for such a map. By such a method and under the condition…

Differential Geometry · Mathematics 2020-05-15 Dexie Lin

We derive a cohomological formula for the analytic index of the Dirac-Ramond operator and we exhibit its modular properties.

High Energy Physics - Theory · Physics 2010-10-27 Orlando Alvarez , Paul Windey

Clifford theory of possibly infinite dimensional modules is studied

Representation Theory · Mathematics 2015-12-31 Fernando Szechtman

We study two special cases of the equivariant index defined in part I of this series. We apply this index to deformations of Spin$^c$-Dirac operators, invariant under actions by possibly noncompact groups, with possibly noncompact orbit…

Differential Geometry · Mathematics 2016-03-11 Peter Hochs , Yanli Song

We show how the index formula for manifolds with fibered boundaries can be used to compute the index of the Dirac operator on Taub-NUT space twisted by an anti-self-dual generic instanton connection.

Differential Geometry · Mathematics 2019-02-19 Andres Larrain-Hubach

We define an $S^1$-equivariant index for non-compact symplectic manifolds with Hamiltonian $S^1$-action. We use the perturbation by Dirac-type operator along the $S^1$-orbits. We give a formulation and a proof of quantization conjecture for…

Symplectic Geometry · Mathematics 2018-01-12 Hajime Fujita

We introduce a new class of natural, explicitly defined, transversally elliptic differential operators over manifolds with compact group actions. Under certain assumptions, the symbols of these operators generate all the possible values of…

Differential Geometry · Mathematics 2021-01-28 Igor Prokhorenkov , Ken Richardson

The geometry of nonholonomic bundle gerbes, provided with nonlinear connection structure, and nonholonomic gerbe modules is elaborated as the theory of Clifford modules on nonholonomic manifolds which positively fail to be spin. We explore…

Differential Geometry · Mathematics 2009-02-25 Sergiu I. Vacaru , Juan F. González--Hernández

In this note the fractional analytic index, for a projective elliptic operator associated to an Azumaya bundle, of DG/0402329 is related to the equivariant index of Atiyah and Singer for an associated transversally elliptic operator.

Differential Geometry · Mathematics 2008-02-22 V. Mathai , R. B. Melrose , I. M. Singer

We give estimates for the eigenvalues of multi-form modified Dirac operators which are constructed from a standard Dirac operator with the addition of a Clifford algebra element associated to a multi-degree form. In particular such…

Differential Geometry · Mathematics 2020-10-27 J. Gutowski , G. Papadopoulos

Let M be a complete Riemannian manifold, D a Dirac-type operator on M whose Weitzenbock curvature is uniformly positive on the complement of a subset Z of M. We show that the coarse index of D is localized to the K-theory of the coarse…

K-Theory and Homology · Mathematics 2012-11-05 John Roe

We formulate, for any Lie group G acting isometrically on a manifold M, the general notion of a G-equivariant elliptic operator that is invertible outside of a G-cocompact subset of M. We prove a version of the Rellich lemma for this…

Differential Geometry · Mathematics 2024-09-02 Hao Guo

In this paper, we give a geometric expression for the multiplicities of the equivariant index of a spin-c Dirac operator.

Differential Geometry · Mathematics 2015-12-23 Paul-Emile Paradan , Michele Vergne

We study Dirac operators acting on sections of a Clifford module ${\cal E}$\ over a Riemannian manifold $M$. We prove the intrinsic decomposition formula for their square, which is the generalisation of the well-known formula due to…

High Energy Physics - Theory · Physics 2007-05-23 T. Ackermann , J. Tolksdorf

Real and complex Clifford bundles and Dirac operators defined on them are considered. By using the index theorems of Dirac operators, table of topological invariants is constructed from the Clifford chessboard. Through the relations between…

Mathematical Physics · Physics 2017-10-20 Ümit Ertem

We develop a formula for the equivariant index of a twisted Dirac operator on a compact globally hyperbolic spacetime with timelike boundary on which a group acts isometrically, subject to APS boundary conditions. The formula is the same as…

Differential Geometry · Mathematics 2026-02-19 Onirban Islam , Lennart Ronge

We introduce a slight modification of the usual equivariant $KK$-theory. We use this to give a $KK$-theoretical proof of an equivariant index theorem for Dirac-Schrodinger operators on a non-compact manifold of nowhere positive curvature.…

K-Theory and Homology · Mathematics 2023-06-28 Y. Abdolmaleki , D. Kucerovsky

We show that knowledge of the source-to-solution map for the fractional Dirac operator acting over sections of a Hermitian vector bundle over a smooth closed connencted Riemannian manifold of dimension $m\geq 2$ determines uniquely the…

Analysis of PDEs · Mathematics 2024-12-20 Hadrian Quan , Gunther Uhlmann