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In this paper we study the boundedness of global pseudo-differential operators on smooth manifolds. By using the notion of global symbol we extend a classical condition of H\"ormander type to guarantee the $L^p$-$L^q$-boundedness of global…

Functional Analysis · Mathematics 2020-05-12 Duván Cardona Sánchez , Vishvesh Kumar , Michael Ruzhansky , Niyaz Tokmagambetov

We study bounded operators defined in terms of the regular representations of the $C^*$-algebra of an amenable, Hausdorff, second countable locally compact groupoid endowed with a continuous $2$-cocycle. We concentrate on spectral…

Operator Algebras · Mathematics 2018-12-13 Marius Mantoiu , Victor Nistor

We consider divergence form operators with complex coefficients on an open subset of Euclidean space. Boundary conditions in the corresponding parabolic problem are dynamical, that is, the time derivative appears on the boundary. As a…

Analysis of PDEs · Mathematics 2024-06-17 Tim Böhnlein , Moritz Egert , Joachim Rehberg

We prove cobordism index invariance for pseudo-differential elliptic operators on closed orbifolds with $K$--theoretical methods.

K-Theory and Homology · Mathematics 2008-07-11 Carla Farsi

We establish sharp $L^2$-Sobolev estimates for classes of pseudodifferential operators with singular symbols whose non-pseudodifferential (Fourier integral operator) parts exhibit two-sided fold singularities. The operators considered…

Analysis of PDEs · Mathematics 2010-02-08 Raluca Felea , Allan Greenleaf , Malabika Pramanik

In this expository note, we present a simple proof of the Fredholm Alternative for compact operators that are norm limits of finite rank operators. We also prove a Fredholm Alternative for pseudodifferential operators of order < 0.

Functional Analysis · Mathematics 2010-11-15 Otgonbayar Uuye

In this paper we establish the semi-Fredholm theory on Hilbert C*-modules as a continuation of Fredholm theory on Hilbert C*-modules established by Mishchenko and Fomenko. We give a definition of a semi-Fredholm operator on Hilbert…

Operator Algebras · Mathematics 2019-12-19 Stefan Ivkovic

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 study the mapping properties of the X-ray transform and its adjoint on spaces of conormal functions on Riemannian manifolds with strictly convex boundary. After desingularizing the double fibration, and expressing the X-ray transform and…

Analysis of PDEs · Mathematics 2024-08-09 Rafe Mazzeo , François Monard

This largely pedagogical paper recalls some facts on defect numbers of products of closed operators employing results from the theory of semi-Fredholm operators and then applies these facts to positive integer powers of symmetric operators…

Functional Analysis · Mathematics 2025-04-10 Christoph Fischbacher , Fritz Gesztesy , Lance L. Littlejohn

We develop a geometric framework for Weyl quantization on pseudo-Riemannian manifolds, in which pseudodifferential operators act on sections of vector bundles equipped with arbitrary connections. We construct the associated star product and…

Mathematical Physics · Physics 2025-07-17 Lars Andersson , Benjamin Moser , Marius A. Oancea , Claudio F. Paganini , Gabriel Schmid

Following Gorokhovsky and Lott and using an extension of the b-pseudodifferential calculus of Melrose, we give a formula for the Chern character of the Dirac index class of a longitudinal Dirac type operators on a foliated manifold with…

Differential Geometry · Mathematics 2009-12-16 Mostafa Esfahani Zadeh

The general theory of boundary value problems for linear elliptic wedge operators (on smooth manifolds with boundary) leads naturally, even in the scalar case, to the need to consider vector bundles over the boundary together with general…

Analysis of PDEs · Mathematics 2013-07-11 Thomas Krainer , Gerardo A. Mendoza

The Clifford bundle formalism (CBF) of differential forms and the theory of extensors acting on $\mathcal{C\ell}(M,g)$ is first used for a fomulation of the intrinsic geometry of a differential manifold $M$ equipped with a metric field…

Mathematical Physics · Physics 2014-05-06 Waldyr A. Rodrigues , Samuel Wainer

We establish an index theorem for Toeplitz operators on odd dimensional spin manifolds with boundary. It may be thought of as an odd dimensional analogue of the Atiyah-Patodi-Singer index theorem for Dirac operators on manifolds with…

Differential Geometry · Mathematics 2007-05-23 Xianzhe Dai , Weiping Zhang

In this paper we study the anti-integrable limit scenario of skew-product systems. We consider a generalization of such systems based on the Frenkel-Kontorova model, and prove the existence of orbits with any fibered rotation number in…

Mathematical Physics · Physics 2016-04-27 Jordi-Lluís Figueras , Dan Strängberg

We prove a Morse index theorem for action functionals on paths that are allowed to reflect at a hypersurface (either in the interior or at the boundary of a manifold). Both fixed and periodic boundary conditions are treated.

Differential Geometry · Mathematics 2024-06-26 Jared Wunsch , Mengxuan Yang , Yuzhou Zou

We define the gauge-equivariant index of a family of elliptic operators invariant with respect to the free action of a family $\GR \to B$ of Lie groups (these families are called ``gauge-invariant families'' in what follows). If the fibers…

K-Theory and Homology · Mathematics 2007-05-23 Victor Nistor

A symbolic calculus for a pseudo-differential operators acting on sections of a homogeneous vector bundle over a compact homogeneous space $G/H$ with compact $G$ and $H$ is developed. We realize the symbol of a pseudo-differential operator…

Analysis of PDEs · Mathematics 2019-12-17 Mitsuru Wilson

This lecture notes cover a Part III (first year graduate) course that was given at Cambridge University over several years on pseudo-differential operators. The calculus on manifolds is developed and applied to prove propagation of…

Analysis of PDEs · Mathematics 2007-05-23 M. S. Joshi