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We generalize the concept of rigid inner forms, defined by Kaletha in [Kal16], to the setting of a local function field $F$ in order state the local Langlands conjectures for arbitrary connected reductive groups over $F$. To do this, we…

Representation Theory · Mathematics 2023-07-12 Peter Dillery

We consider a topological integral transform of Bessel (concentric isospectral sets) type and Fourier (hyperplane isospectral sets) type, using the Euler characteristic as a measure. These transforms convert constructible $\zed$-valued…

Algebraic Topology · Mathematics 2015-05-20 Robert Ghrist , Michael Robinson

Let G be a connected, real, semisimple Lie group contained in its complexification G_C, and let K be a maximal compact subgroup of G. We construct a K_C-G double coset domain in G_C, and we show that the action of G on the K-finite vectors…

Representation Theory · Mathematics 2007-05-23 Bernhard Kroetz , Robert J. Stanton

Schur modules give the irreducible polynomial representations of the general linear group $\mathrm{GL}_t$. Viewing the symmetric group $\mathfrak{S}_t$ as a subgroup of $\mathrm{GL}_t$, we may restrict Schur modules to $\mathfrak{S}_t$ and…

Representation Theory · Mathematics 2020-03-05 Sami H. Assaf , David E. Speyer

Let $G$ be a compact connected Lie group and $P \to M$ a smooth principal $G$-bundle. Let a `cylinder function' on the space $\A$ of smooth connections on $P$ be a continuous function of the holonomies of $A$ along finitely many piecewise…

q-alg · Mathematics 2008-02-03 John C. Baez , Stephen Sawin

In this paper we extend classical Titchmarsh theorems on the Fourier transform of H\"older-Lipschitz functions to the setting of compact homogeneous manifolds. As an application, we derive a Fourier multiplier theorem for…

Functional Analysis · Mathematics 2017-02-21 Radouan Daher , Julio Delgado , Michael Ruzhansky

This paper studies variance functions of Cauchy-Stieltjes Kernel families generated by compactly supported centered probability measures. We describe several operations that allow us to construct additional variance functions from known…

Probability · Mathematics 2019-12-30 Wlodzimierz Bryc , Raouf Fakhfakh , Wojciech Mlotkowski

The aim of this paper is to introduce and to investigate the analogues of torsors for compact quantum groups and to study their role in representation theory. Let A be a unitarizable Hopf *-algebra: we show that there is a category…

Quantum Algebra · Mathematics 2007-05-23 Julien Bichon

The concept of the Schwinger Representation of a finite or compact simple Lie group is set up as a multiplicity-free direct sum of all the unitary irreducible representations of the group. This is abstracted from the properties of the…

Quantum Physics · Physics 2009-11-11 S. Chaturvedi , G. Marmo , N. Mukunda , R. Simon , A. Zampini

Let G be a second countable, locally compact group and let f be a continuous Herz-Schur multiplier on G. Our main result gives the existence of a (not necessarily uniformly bounded) strongly continuous representation on a Hilbert space,…

Representation Theory · Mathematics 2010-01-05 Troels Steenstrup

We discuss convergence in the Fourier algebra A(G) of a locally compact group G and provide a new characterisation of the local spectral sets of G.

Functional Analysis · Mathematics 2024-12-10 Jean Ludwig , Lyudmila Turowska

In this article, we study the local behaviour of the multiple zeta functions at integer points and write down a Laurent type expansion of the multiple zeta functions around these points. Such an expansion involves a convergent power series…

Number Theory · Mathematics 2019-02-13 Biswajyoti Saha

Let S_1 and S_2 be ergodic extensions of finite measure preserving transformations T_1 and T_2, where the extensions are by rotations of a compact group G. Then there is an N-valued function k, measurable with respect to the factor T_1, so…

Dynamical Systems · Mathematics 2011-12-20 Andrey Babichev , Adam Fieldsteel

A certain type of functor on a category of coactions of a locally compact group on C*-algebras is introduced and studied. These functors are intended to help in the study of the crossed-product functors that have been recently introduced in…

Operator Algebras · Mathematics 2016-08-03 S. Kaliszewski , Magnus B. Landstad , John Quigg

In this paper, we will study the continuity of the Fourier transform of measures with respect to the vague topology. We show that the Fourier transform is vaguely discontinuous on R, but becomes continuous when restricting to a class of…

Functional Analysis · Mathematics 2020-02-06 Timo Spindeler , Nicolae Strungaru

The paper deals with continuous and compact mappings generated by the Fourier transform between distinguished function spaces on $\mathbb{R}^n$. The degree of compactness will be measured in terms of related entropy numbers. We are more…

Functional Analysis · Mathematics 2021-12-10 Hans Triebel

We give a complete proof of the expression of capacities of a measure in terms of its Fourier transform.

Metric Geometry · Mathematics 2014-04-29 Mukeru Safari

We define an involution on the space of compact tempered unipotent representations of inner twists of a split simple $p$-adic group $G$ and investigate its behaviour with respect to restrictions to reductive quotients of maximal compact…

Representation Theory · Mathematics 2024-04-01 Anne-Marie Aubert , Dan Ciubotaru , Beth Romano

We give a classification of unitary representations of certain Polish, not necessarily locally compact, groups: the groups of all measurable functions with values in the circle and the groups of all continuous functions on compact, second…

Representation Theory · Mathematics 2014-09-23 Slawomir Solecki

The paper is about methods of discrete Fourier analysis in the context of Weyl group symmetry. Three families of class functions are defined on the maximal torus of each compact simply connected semisimple Lie group $G$. Such functions can…

Mathematical Physics · Physics 2008-04-24 Robert V. Moody , Jiri Patera