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Upcoming Meetings

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April 2024

Women in Number Theory and Geometry (WINGs) 2024

ag.algebraic-geometry dg.differential-geometry nt.number-theory sg.symplectic-geometry
2024-04-15 through 2024-04-18
Shrewsbury; UK

Meeting Type: conference

Contact: Isabel Rendell

Description

WINGs 2024 is the fourth instalment of an annual retreat for women, and other underrepresented genders, in number theory and geometry. It is aimed at early career mathematicians, from PhD onwards. Events will include talks from our eight keynote speakers, a career panel which will also feature participants from industry, social activities, to encourage interaction between participants, and short talks, so that participants can learn about each other’s research interests. Our aim is to counteract the isolation which can be experienced by women and other underrepresented genders in mathematics during their career by fostering a sense of community from the start.

CRM Special Thematic Semester on "Geometric Analysis"

dg.differential-geometry
2024-04-15 through 2024-06-29
Centre de Recherches Mathématiques
Montréal, Québec; Canada

Meeting Type: Thematics Semester (6 workshops and a summer school)

Contact: Spiro Karigiannis

Description

This semester-long program in geometric analysis will focus mostly on complex geometry and Kähler geometry, but with the occasional excursion into real geometry. While the inspiration has deep geometrical roots, the tools are to a large degree those of partial differential equations. A lot of the activity will centre on six workshops:

PDEs in Complex Geometry (April 15-19, 2024)

Special Riemannian Metrics in Dimensions 6,7,8 (April 22-26, 2024)

Analysis of Geometric Singularities (May 13-17, 2024)

Moduli Spaces and Singularities (May 20-24, 2024)

Current Trends in Kähler Metrics with Special Curvature Properties (June 17-21, 2024)

Current Trends in Geometric Flows (June 25-29, 2024)

There will be a significant portion of the term and its resources devoted to training. Apart from resources set aside for students to attend the workshops, the semester will coordinate with the Séminaire de Mathématiques Supérieures (SMS). This school, a Montreal tradition, has been providing high-level training for graduate students since 1960, with some of the very top leaders in the field as lecturers.

We think that the 2024 SMS will be no exception. The topic is:

Flows and Variational Methods in Riemannian and Complex Geometry: Classical and Modern Methods (June 3-14, 2024).

May 2024

Higher Algebra, Geometry, and Topology

at.algebraic-topology
2024-05-06 through 2024-05-10
CIRM
Luminy; France

Meeting Type: conference

Contact: Ricardo Campos, Joana Cirici, Vladimir Dotsenko, Bruno Vallette

Description

The aim of the present conference is to gather mathematicians working in Algebra, Geometry, Topology, and Mathematical Physics. It will cover new foundational works on higher algebra together with its applications.

This conference is the closing event the project ANR « Higher Algebra, Geometry, and Topology », which structures the French community working on these topics.

Confirmed speakers

Alexander BERGLUND (University of Stockholm), Luciana BONATTO (Max Planck Institute for Mathematics Bonn), Basil CORON (Université de Strasbourg/Queen Mary), Berenice DELCROIX-OGER (Université de Montpellier), Coline EMPRIN (Université Sorbonne Paris Nord), Chiara ESPOSITO (University of Salerno), Bernhard KELLER (Université Paris Cité), Guillaume LAPLANTE-ANFOSSI (University of Melbourse), Florian NAEF (Trinity College Dublin), Joost NUITEN (Université de Toulouse), Dan PETERSEN (University of Stockholm), Marcy ROBERTSON (University of Melbourne), Victor ROCA LUCIO (EPFL), Sergey SHADRIN (University of Amsterdam), Andrea SOLOTAR (University of Buenos Aires & Guangdong Technion), Anna SOPENA (Universitat de Barcelona), Christine VESPA (Aix-Marseille Université), Ben WARD (Bowling Green State University).

International Conference on L-functions and Automorphic Forms

nt.number-theory rt.representation-theory
2024-05-13 through 2024-05-16
Vanderbilt University
Nashville, TN; USA

Meeting Type: conference

Contact: see conference website

Description

This conference is devoted to the areas of L-functions and autmorphic forms. In particular, it focusses on the interactions between both fields, which have a long and fruitful history since the fundamental work by Hecke about 90 years ago. The topics will focus on new developments around the areas indicated in the title, as well as establishing and furthering dialogue on new developments at the boundary of these areas. Given the ubiquity of automorphic forms throughout number theory as well as their strong interaction with the field of L-functions, it is very reasonable to expect that both areas will benefit from each other in the future as well. It is likely that this would lead to ideas more broadly useful in other areas of pure mathematics as well as to new types of objects to inspect and new structural questions within both fields.

Graduate Student Conference in Algebra, Geometry, and Topology

ag.algebraic-geometry at.algebraic-topology dg.differential-geometry gn.general-topology gt.geometric-topology mg.metric-geometry nt.number-theory
2024-05-31 through 2024-06-02
Temple University
Philadelphia, Pennsylvania; USA

Meeting Type: conference

Contact: Andrew Clickard

Description

GTA: Philadelphia 2024 is the 9th annual Graduate Student Conference in Algebra, Geometry, and Topology (GSCAGT), to be held on-campus at Temple University in Philadelphia from Friday, May 31 to Sunday, June 2, 2024.

This conference aims to expose graduate students in algebra, geometry, and topology to current research, and provide them with an opportunity to present and discuss their own research. It also intends to provide a forum for graduate students to engage with each other as well as expert faculty members in their areas of research. Most of the talks at the conference will be given by graduate students, with four given by distinguished keynote speakers:

Sarah Koch (University of Michigan)

Nick Miller (University of Oklahoma)

Hiro Lee Tanaka (Texas State University)

Isabel Vogt (Brown University)

This event is sponsored by the Department of Mathematics at Temple University and is pending sponsorship from the NSF. Registration is now open. The deadline to register for funding is April 17th, after which it will be considered on a rolling basis. We encourage participants to apply early; once NSF funding for the conference has been approved, applications filed before deadline will receive a decision within two weeks of submission.

GTA: Philadelphia 2024 (the 9th annual Graduate Student Conference in Algebra, Geometry, and Topology)

ag.algebraic-geometry at.algebraic-topology nt.number-theory
2024-05-31 through 2024-06-02
Temple University
Philadelphia, PA; USA

Meeting Type: conference for graduate students

Contact: see conference website

Description

GTA: Philadelphia 2024 is the 9th annual Graduate Student Conference in Algebra, Geometry, and Topology (GSCAGT), to be held on-campus at Temple University in Philadelphia from Friday, May 31 to Sunday, June 2, 2024.

This conference aims to expose graduate students in algebra, geometry, and topology to current research, and provide them with an opportunity to present and discuss their own research. It also intends to provide a forum for graduate students to engage with each other as well as expert faculty members in their areas of research. Most of the talks at the conference will be given by graduate students, with four given by distinguished keynote speakers.

This event is sponsored by the Department of Mathematics at Temple University and is pending sponsorship from the NSF.

June 2024

Summer School and Workshop on Relative Langlands Duality

nt.number-theory rt.representation-theory
2024-06-03 through 2024-06-08
University of Minnesota
Minneapolis, MN; USA

Meeting Type: summer school and conference

Contact: see conference website

Description

The relative Langlands program is a generalization of the classical Langlands program from reductive groups to certain homogeneous spaces. The recent work of Ben-Zvi, Sakellaridis, and Venkatesh on relative Langlands duality reveals new connections of the program to algebraic geometry and physics. The summer school and workshop will cover several aspects of the relative Langlands program and explore those new connections.

Algebraic Structures in Topology II

at.algebraic-topology ct.category-theory
2024-06-05 through 2024-06-14
San Juan; Puerto Rico

Meeting Type: conference, summer school, workshop

Contact: Ralph Kaufmann, Mona Merling, Jeremy Miller, Manuel Rivera, Natalia Pacheco Tallaj

Description

The conferences will feature a variety of events focusing on recent developments in algebraic topology and their applications to geometry, physics, and data science.

Additive Combinatorics Summer School

co.combinatorics nt.number-theory rt.representation-theory
2024-06-10 through 2024-06-14
Erdős Center of the Alfréd Rényi Institute of Mathematics
Budapest; Hungary

Meeting Type: summer school

Contact: Gergely Kiss, Mate Matolcsi, Gabor Somlai

Description

The summer school is dedicated to graduate students and young researchers, and aims to give an introduction to recent techniques and topics of additive combinatorics. The lectures of the summer school will concentrate on recent developments of the polynomial method, some combinatorial methods of additive combinatorics, and the introduction of Fourier analytic techniques connected to them. The main topics will be presented by top researchers of the area.

The lecturers will be Julia Wolf, Christian Elsholtz, Peter Pal Pach, Sean Prendiville.

International Conference on Lie Algebra and Number Theory

nt.number-theory ra.rings-and-algebras rt.representation-theory
2024-06-10 through 2024-06-14
National Institute of Technology Calicut
Kozhikode, Kerala; India

Meeting Type: conference

Contact: Dr. Saudamini Nayak, Dr. Chiranjit Ray, Dr. Sudhansu Sekhar Rout

Description

Lie algebras and superalgebras are among the most important algebraic structures with ample applications in modern mathematics like geometry, harmonic analysis, algebra and representation theory, and number theory. Number Theory is one of the oldest and classical branch of mathematics. This conference aims to bring together researchers working in various areas of algebra and number theory to exchange knowledge and further possible collaborations. The key topics of the conference are as follows:

  • Structure and representation theory of finite and infinite dimensional Lie algebras/Lie superalgebras
  • Number Theory (Algebraic Number Theory/ Modular Forms/ Automorphic Forms/ Diophantine Equations/ Partition Theory)
  • Applications of Lie Theory to Number Theory.

Additive Combinatorics Workshop

co.combinatorics nt.number-theory rt.representation-theory
2024-06-17 through 2024-06-21
Erdős Center of the Alfréd Rényi Institute of Mathematics
Budapest; Hungary

Meeting Type: conference

Contact: Gergely Kiss, Mate Matolcsi, Gabor Somlai

Description

This conference is devoted to the most recent results of Additive Combinatorics. The topic of the conference is aimed to emphasize the rich interactions between additive combinatorics, harmonic analysis and number theory. The conference will bring together some recognized experts of the field, junior researchers (postdoctoral fellows and graduate students), and senior researchers from various aspects of the main topic. Beside the discussion on the recent progress in the field, it is also aimed to initiate interaction and collaboration among the participants.

Current Trends in Kähler Metrics with Special Curvature Properties

ag.algebraic-geometry cv.complex-variables dg.differential-geometry
2024-06-17 through 2024-06-21
UQAM
Montreal; Canada

Meeting Type: conference

Contact: Vestislav Apostolov, Julien Keller, Julius Ross, Eleonora Di Nezza

Description

The scientific root of this workshop goes back to the seminal works of E. Calabi in the 1950s, who proposed to find a canonical Kähler metric, called extremal, representing a cohomology class of a compact Kähler manifold. Calabi showed that in this setting, the search for extremal Kähler metrics can be reduced to solving a non-linear PDE. A particular example of extremal Kähler metrics are the celebrated Kähler-Einstein metrics whose existence theory is now settled, starting with the resolution of Calabi’s famous conjecture by Aubin and Yau in the 1970s (the non-obstructed case), and culminating in recent times with the resolution of the Yau-Tian-Donaldson (YTD) conjecture in the obstructed Fano case. These efforts motivated a general YTD correspondence, which predicts that the existence of special Kähler metrics should be expressed in terms of a suitable complex-analytic/algebraic notion of stability of the underlying complex/projective variety.

Many partial results on such general YTD correspondences have been obtained recently in various special cases. For instance, the existence of a constant scalar curvature Kähler metric on a smooth toric variety is now settled whereas the log Fano case has been tackled recently, notably via weighted versions of Kähler-Ricci solitons. Another challenging direction of active current research consists of finding computable or even algorithmic criteria for algebraic stability (or for the existence of special Kähler metrics) on a given manifold, for example as in the recent works in the case of spherical varieties. Finally, the existence of special Kähler metrics or, equivalently, the corresponding stability notions, are expected to give the right tool for defining a good moduli space of polarized varieties.

The Ninth Pacific Rim Conference in Mathematics Darwin

ag.algebraic-geometry ap.analysis-of-pdes dg.differential-geometry pr.probability rt.representation-theory sg.symplectic-geometry
2024-06-17 through 2024-06-21
Australian National University
Darwin, Northern Territory; Australia

Meeting Type: International Conference

Contact: Tony Martin

Description

The Ninth Pacific Rim Conference on Mathematics (PRCM) will be held from Mon, Jun 17 2024 to Fri, Jun 21 2024 at the Darwin Convention Centre, in Darwin (Northern Territory, Australia), hosted by the Mathematical Sciences Institute (MSI), Australian National University (ANU). The PRCM is a broad mathematical event held every few years that covers a wide range of exciting research in contemporary mathematics. Its objectives are to offer a venue for the presentation to and discussion among a wide audience of the latest trends in mathematical research, and to strengthen ties between mathematicians working in the Pacific Rim region. The conference will provide mathematicians with opportunities to engage with international research leaders, established colleagues, and junior researchers.

Open Communications in Nonlinear Mathematical Physics - 2024

ap.analysis-of-pdes ca.classical-analysis-and-odes dg.differential-geometry ds.dynamical-systems mp.mathematical-physics
2024-06-23 through 2024-06-29
University of Milan, Department of Mathematics, Italy and CIC Cuernavaca, Mexico
Bad Ems, Rhineland-Palatinate; Germany

Meeting Type: Conference

Contact: Norbert Euler

Description

The conference welcomes experts and students in the subject of nonlinear mathematical physics, where the focus is on the development and use of mathematical theories to analyse and solve nonlinear problems thaat arise in nature and in technologies. Participants can present their recults orally or in the form of a poster. The main subjects include nonlinear continuous and discrete integrable equations, non-commutative geometry, symmetry analysis, wave propagations, and the classification of equations. One evening of talks is reserved for the non-expert audience where the general public is invited to listen to presentations which will be of a non-technical and more philosophical nature. This open-door session is titled "An Evening of Science and Philosophy" and participation is free for everyone.

Conference on Solvable Lattice Models, Number Theory and Combinatorics

co.combinatorics mp.mathematical-physics nt.number-theory rt.representation-theory
2024-06-24 through 2024-06-26
Hamilton Mathematics Institute, Trinity College Dublin
Dublin; Ireland

Meeting Type: conference

Contact: Solomon Friedberg, Ben Brubaker, Daniel Bump, Henrik Gustafsson, Katrin Wendland

Description

This conference focuses on new and emerging connections between solvable lattice models and special functions on p-adic groups and covering groups, uses of quantum groups, Hecke algebras and other methods to study representations of p-adic groups and their covers, and advances in algebraic combinatorics and algebraic geometry.

AMS MRC conference Homotopical Combinatorics

at.algebraic-topology co.combinatorics
2024-06-30 through 2024-07-06
AMS
Java Center, NY; USA

Meeting Type: conference / workshop

Contact: Kyle Ormsby

Description

Transfer systems are a new combinatorial object that exhibit surprising connections between abstract homotopy theory, equivariant topology, and combinatorics. About ten years ago, Blumberg and Hill defined the related "indexing systems'' as the central algebraic object controlling twisted multiplications that naturally arise in the study of equivariant cohomology theories. Rubin and Balchin--Barnes--Roitzheim independently recast this notion in a much simpler framework, characterizing indexing systems in terms of transfer systems, as a particular kind of weak subposet of the lattice of subgroups of a finite group G , ordered by inclusion. Work of Ormsby--Osorno and teams of collaborators has shown how the natural generalization of this notion to an arbitrary poset has fascinating combinatorial properties, and Balchin--MacBrough--Ormsby have further connected this to abstract homotopy theories on posets. Each of these connections provides exciting results which can be transferred and reinterpreted in the other fields, yielding unexpected new structure and theorems.

This MRC will introduce participants to this burgeoning new area, bringing together researchers with interests in combinatorics, algebraic topology, and abstract homotopy theory. The field is rife with open problems, including basic questions about the structure of transfer systems, combinatorics problems associated to counting transfer systems for natural families of posets, identifying connections with other combinatorial structures, and applying the language of model categories to recast and reform these questions.

One of the exciting features of the program is that there are few prerequisites. Familiarity with abstract homotopy theory or with modern methods of algebraic topology will allow deeper engagement with some of the potential problems, but is not required, and much of the subject can be approached purely combinatorially. Before the workshop, relevant readings will be provided to help provide background, and an online collaboration platform will be used to start discussing material and to begin building community. At the workshop, participants can expect to work in teams on research programs, to engage with lectures from senior faculty participants about aspects of homotopical combinatorics, and to have open feedback sessions for further discussion.

The primary focus of the workshop is supporting early-career researchers, including advanced graduate students, postdocs, and pre-tenure faculty. As such, there will also be professional development sessions, the topics of which will be driven by participant interest and need. We especially encourage members of traditionally excluded groups to apply.

Applications will be accepted on MathPrograms.org through Thursday, February 15, 2024 (11:59 p.m. EST).

July 2024

International Geometry Symposium in Honor of Prof. Dr. Aysel Turgut Vanlı

dg.differential-geometry
2024-07-01 through 2024-07-02
Munzur University
Tunceli; Turkey

Meeting Type: Symposium

Contact: İnan ÜNAL

Description

Dear collegues

We are very proud to invite you to the "Online International Geometry Symposium in Honor of Prof. Dr. Aysel Turgut Vanlı" to be held on 1-2 July 2024. The International Geometry Symposium will be hosted by Munzur University and Amasya University. The symposium is dedicated to the 60th birthday of Prof. Aysel TURGUT VANLI, a faculty member of Gazi University, Department of Mathematics, who has been conducting scientific studies in the field of geometry for more than 35 years.

The symposium will be held online via Microsoft teams. There is no registration fee.

In this symposium, it is expected to present scientific studies in many areas of geometry, especially in differential geometry, Riemannian geometry, semi-Riemannian geometry, information geometry, and complex geometry. The symposium has 7 invited speakers who are experts in their fields:

Bang-Yen CHEN (Michigan State University, USA)

Ryszard DESZCZ (Wroclaw University of Environmental and Life Sciences, Poland)

Rajendra PRASAD (University of Lucknow, India)

Zafar AHSAN (Aligarh Muslim University, India)

Giulia DILEO (University of Bari Aldo Moro, Italy)

Beldjilali GHERICI (University of Mascara, Algeria)

Majid Ali CHOUDARY (Maulana Azad National University of Urdu, India)

We are honoured by your participation in the symposium which will bring together speakers and participants from different parts of the world.

With my regards.

Head of the Organising Committee

Assoc. Prof. Dr. İnan ÜNAL

Algebraic K-Theory and Arithmetic

ag.algebraic-geometry kt.k-theory-and-homology nt.number-theory rt.representation-theory
2024-07-07 through 2024-07-13
Institute of Mathematics, Polish Academy of Science, Będlewo Conference Center
Będlewo, Greater Poland; Poland

Meeting Type: conference

Contact: see conference website

Description

none

PCMI 2024 Research Topic: Motivic Homotopy

ag.algebraic-geometry at.algebraic-topology kt.k-theory-and-homology
2024-07-07 through 2024-07-27
Institute for Advanced Study/Parc City Mathematics Institute
Park City, Utah; USA

Meeting Type: meeting with several components

Contact: Oliver Röndigs

Description

The IAS/Park City Mathematics Institute is a three-week residential summer session with a graduate summer school, a research program, an undergraduate summer school, and an undergraduate faculty program. More information can be found on the conference website. PCMI encourages applications from all those with interest in the program, both from the US and internationally. This year it is organized by Benjamin Antieau (Northwestern University), Marc Levine (Universität Duisburg-Essen), Oliver Röndigs (Universität Osnabrück), Alexander Vishik (University of Nottingham), and Kirsten Wickelgren (Duke University).

Topologie

at.algebraic-topology gt.geometric-topology
2024-07-21 through 2024-07-27
MFO
Oberwolfach; Germany

Meeting Type: workshop

Contact: Mark Behrens, Ruth Charney, Oscar Randal-Williams, Andras Stipsicz

Description

See conference website

August 2024

Young Topologists Meeting 2024

ag.algebraic-geometry at.algebraic-topology ct.category-theory gn.general-topology gt.geometric-topology kt.k-theory-and-homology
2024-08-05 through 2024-08-09
University of Münster
Münster; Germany

Meeting Type: conference

Contact: Konrad Bals

Description

The Young Topologists Meeting is an annual international conference aimed at early-career researchers in topology - both pure and applied - covering the whole breadth of the subject. It serves as a platform for graduate, PhD students, and early postdocs to present their research, exchange ideas, and build international connections.

Previous editions of the conference have been organized by the EPFL, Switzerland, the University of Copenhagen, Denmark, and jointly by the University of Stockholm and the Royal Institute of Technology, Sweden. Next up: Münster, Germany.

Motivic homotopy, K-theory, and Modular Representations

ag.algebraic-geometry at.algebraic-topology rt.representation-theory
2024-08-09 through 2024-08-11
University of Southern California
Los Angeles, CA; USA

Meeting Type: conference

Contact: Aravind Asok, Christopher Bendel, Christian Haesemeyer, Julia Pevtsova, Paul Sobaje, Jared Warner

Description

A celebration of the mathematics of Eric Friedlander on the occasion of his 80th birthday

September 2024

Representations of p-adic Groups and the Langlands Correspondence, in honor of Colin Bushnell

nt.number-theory rt.representation-theory
2024-09-02 through 2024-09-04
King's College London
London; UK

Meeting Type: conference

Contact: see conference website

Description

none

Ramification in geometric Langlands and non-abelian Hodge theory

ag.algebraic-geometry nt.number-theory rt.representation-theory
2024-09-09 through 2024-09-13
Heidelberg University
Heidelberg, Baden-Württemberg; Germany

Meeting Type: workshop

Contact: Andreas Hohl, Johannes Horn, Konstantin Jakob, Judith Ludwig, Timo Richarz

Description

This workshop is motivated by recent developments in geometric representation theory, related to wild ramification in the geometric Langlands program and non-abelian Hodge theory. The goal is to bring together researchers in these fields and researchers working on irregular singularities (in particular Stokes phenomena), to stimulate future interactions.

It will feature research talks from experts in the field, a poster session for early-career researchers as well as three mini-courses by

Jean-Baptiste Teyssier (Sorbonne Université), Valerio Toledano-Laredo (Northeastern University) and Zhiwei Yun (Massachusetts Institute of Technology).

December 2024

Representations of p-adic Groups - application form for early career researchers

rt.representation-theory nt.number-theory
2024-12-01 through 2024-12-06
Mathematisches Forschungsinstitut Oberwolfach
Oberwolfach; Germany

Meeting Type: conference

Contact: Jessica Fintzen, David Schwein, Maarten Solleveld

Description

See the website for details on the subject matter of the workshop.

Per MFO rules, participation is generally limited to invited mathematicians. However, we have reserved a small number of places for early-career mathematicians, who may apply to participate by completing a short application.

January 2025

Introductory School: Methods in Representation Theory and Operator Algebras

kt.k-theory-and-homology oa.operator-algebras rt.representation-theory
2025-01-06 through 2025-01-10
CIRM
Marseille; UK

Meeting Type: winter school

Contact: Haluk Sengun

Description

The research school is an introductory meeting to the thematic program “Representation Theory and Noncommutative Geometry” to be held at IHP from January to March 2025. The trimester is part of an ongoing effort to bridge two fiels of Mathematics : the representation theory of locally compact groups and the theory of operator algebras. These research domains share origins in harmonic analysis, spectral theory and quantum mechanics but grew in separate directions. Recent progress in representation theory, involving especially non-Riemannian symmetric spaces and spherical varieties, and new tools developed in operator algebras, especially those involving K-theory and the other methods of non-commutative geometry, offer exciting prospects for new work at the interface between the two fields.

Mini-course are:

  • Erik P. van den Ban (Universiteit Utrecht): Harmonic analysis of non-Riemannian symmetric spaces
  • Tyrone Crisp (University of Maine): Tempered representations from the point of view of Langlands, and from the point of view of operator algebras
  • Omar Mohsen (Université de Paris-Saclay): Introduction to hypoelliptic operators and their index theory
  • Hang Wang (East China Normal University): Groups C*-algebras and their K-theory

Intertwining operators and geometry

oa.operator-algebras rt.representation-theory
2025-01-20 through 2025-01-24
Institut Henri Poincare
Paris; UK

Meeting Type: conference

Contact: Haluk Sengun

Description

Intertwining operators are ubiquitous in representation theory. Their construction typically requires a considerable amount of analysis, and they often assume an interesting form. For instance, they are frequently pseudodifferential operators associated with pseudodifferential calculi of intense current study in noncommutative geometry. Conversely, in all multiplicity-one decompositions of representations (e.g. the theta correspondence), the essentially unique intertwining operator, or its symbol, should encode important information on the representation-theoretic decomposition.

However, those operators have received little attention from within operator algebra theory. This meeting will be the occasion to present classical and recent aspects of the theory of intertwining operators and explore the connections between operator algebras and representation theory.

Topics of special interest will include:

  • Symmetry breaking operators: special families of intertwining operators between representations of a group and a subgroup. These operators, for Lie groups and algebraic groups over local fields, are the subject of intense study in various settings via analytic, algebraic and geometric methods.
  • Concrete study of the intertwining operators appearing in the theta-correspondence over local fields, including interpretations coming from operator algebras and noncommutative geometry.
  • Applications of intertwining operators in equivariant index theory and noncommutative geometry, such as K-theoretic constructions based on the BGG complex.

February 2025

Tempered representations and K-theory

kt.k-theory-and-homology oa.operator-algebras rt.representation-theory
2025-02-24 through 2025-02-28
Institut Henri Poincare
Paris; UK

Meeting Type: conference

Contact: Haluk Sengun

Description

The classification of tempered irreducible representations for real reductive groups was completed in the 1970s by Knapp and Zuckerman, following Harish-Chandra's work on the Plancherel formula. But some aspects of the subject are now undergoing a re-examination, following the discovery of new perspectives. C*-algebras and K-theory are valuable tools in Representation Theory, as shown, for instance, by the Mackey bijection. Indeed, it was the Connes-Kasparov isomorphism in K-theory that motivated the search for a natural bijection between the tempered dual of a real reductive group and the unitary dual of its Cartan motion group, as initially suggested by Mackey in the 1970s.

The meeting will focus on recent developments in which K-theoretic ideas have offered new perspectives on the tempered dual for reductive groups or symmetric spaces, and conversely on new approaches to operator-algebraic problems using contemporary tools in representation theory.

Topics will include:

  • New approaches to the Mackey bijection through pseudodifferential operator theory, which has itself undergone an extensive conceptual redesign in the past decade, thanks again to C*-algebra and K-theory connections;
  • New perspectives on the the Connes-Kasparov isomorphism using Dirac cohomology and cohomological induction;
  • Higher orbital intergrals, which make it possible to go beyond the "noncommutative topology of the tempered dual'', hinting at something like the "differential geometry'' of this noncommutative space;
  • Study of the Casselman-Schwartz algebras and their K-theory via Paley-Wiener theorems, and connections with the Connes-Kasparov isomorphism;
  • C*-algebraic analysis of the tempered dual from the point of view of G as a symmetric space for GxG, and more generally of the tempered spectrum of symmetric spaces.

March 2025

Analysis on homogeneous spaces and operator algebras

kt.k-theory-and-homology nt.number-theory oa.operator-algebras rt.representation-theory
2025-03-24 through 2025-03-28
Institut Henri Poincare
Paris; UK

Meeting Type: conference

Contact: Haluk Sengun

Description

Harmonic analysis on homogeneous spaces is a fundamental area of research that simultaneously generalizes classical harmonic analysis on groups and on Riemannian symmetric spaces. It naturally relates to many areas of mathematics, playing a central role in representation theory and the theory of automorphic forms.

This workshop will be an occasion to introduce recent developments in some of these areas. It will also aim to explore new connections between them and extend the fruitful interactions between C*-algebras, harmonic analysis and representation theory beyond the classical setting of groups to the general setting of homogeneous spaces.

Topics will include:

  • C*-algebraic approaches to the tempered dual of non-Riemannian symmetric spaces;
  • Harmonic analysis and Plancherel theory for spherical spaces;
  • Connections with the Langlands program and periods of automorphic forms;
  • Recent approaches to the theta correspondence via C*-algebras