Mathematical physics, including mathematics, is a research area where novel mathematical techniques are invented to tackle problems in physics, and where novel mathematical ideas find an elegant physical realization. Historically, it would have been impossible to distinguish between theoretical physics and pure mathematics. Often spectacular advances were seen with the concurrent development of new ideas and fields in both mathematics and physics. Here one might note Newton's invention of modern calculus to advance the understanding of mechanics and gravitation. In the twentieth century, quantum theory was developed almost simultaneously with a variety of mathematical fields, including linear algebra, the spectral theory of operators and functional analysis. This fruitful partnership continues today with, for example, the discovery of remarkable connections between gauge theories and string theories from physics and geometry and topology in mathematics.
Format results

28 talksCollection Number C22011
Talk

Welcome and Opening Remarks
Kevin Costello Perimeter Institute for Theoretical Physics

3d Theories and Twists I
Kevin Costello Perimeter Institute for Theoretical Physics

3d Gauge Theory and Elliptic Stable Envelopes I
Andrei Okounkov Columbia University

Classical BV Formalism and Topological Quantum Field Theory
Philsang Yoo Seoul National University

A and B models in 3d and 4d I
Justin Hilburn Perimeter Institute for Theoretical Physics

3d B Models and Knot Homology I
Lev Rozansky University of North Carolina  Chapel Hll

On Boundary VOA's
Davide Gaiotto Perimeter Institute for Theoretical Physics

3d Gauge Theory and Elliptic Stable Envelopes II
Mykola Dedushenko Stony Brook University


Global Categorical Symmetries
34 talksCollection Number C22008Talk

Welcome and Opening Remarks
Theo JohnsonFreyd Dalhousie University

NonInvertible Symmetries in d>2
Justin Kaidi Stony Brook University

Monodromy and derived equivalences
Andrei Okounkov Columbia University

Lessons from SU(N) SeibergWitten Geometry
Emily Nardoni University of Tokyo

Vertex algebras and selfdual YangMills theory
Kevin Costello Perimeter Institute for Theoretical Physics

Noninvertible Global Symmetries in the Standard Model
ShuHeng Shao Stony Brook University

Analytic Langlands correspondence over C and R
Pavel Etingof Massachusetts Institute of Technology (MIT)

A (kind of) monoidal localization theorem for the small quantum group
Cris Negron University of Southern California


Women at the Intersection of Mathematics and Theoretical Physics
16 talksCollection Number C21002Talk

Welcome and Opening Remarks

Bianca Dittrich Perimeter Institute for Theoretical Physics

Theo JohnsonFreyd Dalhousie University

Sylvie Paycha Universität Potsdam

Katarzyna Rejzner University of York

Anne Taormina Durham Academy

Reiko Toriumi Okinawa Institute of Science and Technology (OIST)


Division algebraic symmetry breaking
Cohl Furey Humboldt University of Berlin

State sum models with defects
Catherine Meusburger University of ErlangenNuremberg

Quantum information and black holes
Johanna Erdmenger University of Würzburg

Researcher Presentations

Karen Yeats University of Waterloo

Sabine Harribey Nordita  Nordic Institute for Theoretical Physics

Philine van Vliet Deutsches ElektronenSynchrotron (DESY)

Maria Elena TejedaYeomans University of Colima

Maryam Khaqan Emory University


Mathematical Puzzles from Causal Set Quantum Gravity
Sumati Surya Raman Research Institute

On generalized hyperpolygons
Laura Schaposnik University of Illinois at Chicago

Exploring spacetime beyond classicality
Renate Loll Radboud Universiteit Nijmegen


Octonions and the Standard Model
16 talksCollection Number C21001Talk

Welcome and Opening Remarks
Kirill Krasnov University of Nottingham

Finite quantum geometry, octonions and the theory of fundamental particles.
Michel DuboisViolette University of ParisSaclay

Supersymmetry and RCHO revisited
Paul Townsend University of Cambridge

Spin (8,9,10), Octonions and the Standard Model
Kirill Krasnov University of Nottingham

Gravity as the square of gauge theory
Leron Borsten Imperial College London

A Magic Pyramid of Supergravity Theories from YangMills Squared
Mia Hughes Imperial College London

Division algebraic symmetry breaking

Cohl Furey Humboldt University of Berlin

Mia Hughes Imperial College London


Clifford algebra of the Standard Model
Ivan Todorov Bulgarian Academy of Sciences


Geometric Representation Theory
24 talksCollection Number C20030Talk


Singularities of Schubert varieties within a right cell
Martina Lanini Università degli Studi di Roma Tor Vergata

Yangians and cohomological Hall algebras of Higgs sheaves on curves
Olivier Schiffmann University of ParisSaclay

Tate's thesis in the de Rham setting
Sam Raskin The University of Texas at Austin

Fundamental local equivalences in quantum geometric Langlands
Gurbir Dhillon Stanford University

Zalgebras from Coulomb branches
Oscar Kivinen California Institute of Technology

Cotangent complexes of moduli spaces and Ginzburg dg algebras
Sarah Scherotzke University of Luxembourg



Elliptic Cohomology and Physics
11 talksCollection Number C20029Talk

Projective elliptic genera and applications
Fei Han National University of Singapore

Topological Modular Forms and Quantum Field Theory
Davide Gaiotto Perimeter Institute for Theoretical Physics

Equivariant elliptic cohomology with integral coefficients
Lennart Meier Utrecht University

The de Rham model for elliptic cohomology from physics
Arnav Tripathy Harvard University

Quasisymmetric characteristic numbers for Hamiltonian toric manifolds
Jack Morava Johns Hopkins University

Codes, vertex algebras and topological modular forms
Gerd Laures RuhrUniversität Bochum


Elliptic characteristic classes, bow varieties, 3d mirror duality
Richard Rimanyi University of North Carolina  Chapel Hll


PSI 2019/2020  Statistical Physics (Kubiznak)
3 talksCollection Number C19036Talk

PSI 2019/2020  Statistical Physics  Lecture 1
David Kubiznak Charles University

PSI 2019/2020  Statistical Physics  Lecture 2
David Kubiznak Charles University

PSI 2019/2020  Statistical Physics  Lecture 3
David Kubiznak Charles University


PSI 2019/2020  Mathematica (Xu)
Collection Number C19031 
QFT for Mathematicians
25 talksCollection Number C19023Talk

Lecture 1: Factorization Algebras and the General Structure of QFT
Philsang Yoo Seoul National University

Lecture 1: Supersymmetric Quantum Mechanics and All That
Mathew Bullimore Durham University

TA Session: 0d QFT and Feynman diagrams
Theo JohnsonFreyd Dalhousie University

Lecture 1: Boundary Conditions and Extended Defects
Davide Gaiotto Perimeter Institute for Theoretical Physics

Lecture 2: Factorization Algebras and the General Structure of QFT
Kevin Costello Perimeter Institute for Theoretical Physics

TA Session: Supersummetry Algebras
Chris Elliott University of Massachusetts Amherst

Lecture 3: Factorization Algebras and the General Structure of QFT
Philsang Yoo Seoul National University

Lecture 2: Supersymmetric Quantum Mechanics and All That
Mathew Bullimore Durham University


Cohomological Hall Algebras in Mathematics and Physics
19 talksCollection Number C19018Talk

An introduction to Cohomological Hall algebras and their representations
Yan Soibelman Kansas State University

Gauge theory, vertex algebras and COHA
Davide Gaiotto Perimeter Institute for Theoretical Physics

Networks of intertwiners, 3d theories and superalgebras
Yegor Zenkevich Institute for Theoretical and Experimental Physics

COHA of surfaces and factorization algebras
Mikhail Kapranov Kavli Institute for Theoretical Physics (KITP)

Yangians from cohomological Hall algebras
Ben Davison University of Edinburgh

Algebraic structures of T[M3] and T[M4]
Sergei Gukov California Institute of Technology (Caltech)  Division of Physics Mathematics & Astronomy

Categorification of 2d cohomological Hall algebras
Francesco Sala University of Tokyo

Short starproducts for filtered quantizations
Pavel Etingof Massachusetts Institute of Technology (MIT)


Topological Holography Course (Costello)
8 talksCollection Number C19017Talk

Topological Holography Course  Lecture 1
Kevin Costello Perimeter Institute for Theoretical Physics

Topological Holography Course  Lecture 2
Kevin Costello Perimeter Institute for Theoretical Physics

Topological Holography Course  Lecture 3
Kevin Costello Perimeter Institute for Theoretical Physics

Topological Holography Course  Lecture 5
Kevin Costello Perimeter Institute for Theoretical Physics

Topological Holography Course  Lecture 6
Kevin Costello Perimeter Institute for Theoretical Physics

Topological Holography Course  Lecture 7
Kevin Costello Perimeter Institute for Theoretical Physics

Topological Holography Course  Lecture 8
Kevin Costello Perimeter Institute for Theoretical Physics

Topological Holography Course  Lecture 9
Kevin Costello Perimeter Institute for Theoretical Physics


Higher Algebra and Mathematical Physics
21 talksCollection Number C18024Talk

Welcome and Opening Remarks

Theo JohnsonFreyd Dalhousie University

Andre Henriques University of Oxford
PIRSA:18080042 

N=1 supersymmetric vertex algebras of small index
Davide Gaiotto Perimeter Institute for Theoretical Physics

Geometric Langlands: Comparing the views from CFT and TQFT
Joerg Teschner Deutsches ElektronenSynchrotron, DESY  Theory Group

Cutting and gluing branes
David Nadler University of California System

The lowenergy TQFT of the generalized double semion model
Arun Debray University of Texas  Austin


Moduli of connexions on open varieties
Bertrand Toen Paul Sabatier University

The Duistermaat–Heckman distribution for the based loop group
Lisa Jeffrey University of Toronto




Women at the Intersection of Mathematics and Theoretical Physics
16 talksCollection Number C21002 
Octonions and the Standard Model
16 talksCollection Number C21001Over the years, various researchers have suggested connections between the octonions and the standard model of particle physics. The past few years, in particular, have been marked by an upsurge of activity on this subject, stimulated by the recent observation that the standard model gauge group and fermion representation can be elegantly characterized in terms of the octonions. This workshop, which will be the first ever on this topic, is intended to bring this new community together in an attempt to better understand these ideas, establish a common language, and stimulate further progress.
The workshop will consist of an hourlong talk every Monday at noon (EST), with the first talk on Monday February 8, and the final talk on Monday May 17.

Geometric Representation Theory
24 talksCollection Number C20030 
Elliptic Cohomology and Physics
11 talksCollection Number C20029 
PSI 2019/2020  Statistical Physics (Kubiznak)
3 talksCollection Number C19036PSI 2019/2020  Statistical Physics (Kubiznak) 


Cohomological Hall Algebras in Mathematics and Physics
19 talksCollection Number C19018This workshop will bring together leading mathematicians and physicists interested in the Cohomological Hall algebra as it appears in the study of moduli spaces and in gauge and string theory.

Topological Holography Course (Costello)
8 talksCollection Number C19017Topological Holography Course (Costello) 
Higher Algebra and Mathematical Physics
21 talksCollection Number C18024Higher algebra has become important throughout mathematics physics and mathematical physics and this conference will bring together leading experts in higher algebra and its mathematical physics applications. In physics the term algebra is used quite broadly any time you can take two operators or fields multiply them and write the answer in some standard form a physicist will be happy to call this an algebra. Higher algebra is characterized by the appearance of a hierarchy of multilinear operations (e.g. A_infty and L_infty algebras). These structures can be higher categorical in nature (e.g. derived categories cosmology theories) and can involve mixtures of operations and cooperations (Hopf algebras Frobenius algebras etc.). Some of these notions are purely algebraic (e.g. algebra objects in a category) while others are quite geometric (e.g. shifted symplectic structures). An early manifestation of higher algebra in highenergy physics was supersymmetry. Supersymmetry makes quantum field theory richer and thus more complicated but at the same time many aspects become more tractable and many problems become exactly solvable. Since then higher algebra has made numerous appearances in mathematical physics both high and lowenergy. A telltale sign of the occurrence of higher structures is when classification results involve cohomology. Group cohomology appeared in the classification of condensed matter systems by the results of Wen and collaborators. Altland and Zirnbauer s "tenfold way" was explained by Kitaev using Ktheory. And Kitaev's 16 types of vortexfermion statistics were classified by spin modular categories. All these results were recently enhanced by the work of Freed and Hopkins based on cobordism theory. In high energy physics cohomology appears most visibly in the form of "anomalies". The ChernSimons anomaly comes from the fourth cohomology class of a compact Lie group and the 5brane anomaly is related to a certain cohomology class of the Spin group. The classification of conformal field theories involves the computation of all algebras objects in certain monoidal categories which is a type of nonabelian cohomology. Yet another important role for higher algebra in mathematical physics has been in the famous Langlands duality. Langlands duality began in number theory and then became geometry. It turned into physics when Kapustin and Witten realized geometric Langlands as an electromagnetic duality in cN=4 super YangMills theory. Derived algebra higher categories shifted symplectic geometry cohomology and supersymmetry all appear in Langlands duality. The conference speakers and participants drawn from both sides of the Atlantic and connected by live video streams will explore these myriad aspects of higher algebra in mathematical physics.