Quantum field theory was originally developed as the extension of quantum mechanics needed to accommodate the principles of special relativity. Today quantum field theory is the modern paradigm with which we understand particle physics, condensed matter systems, and many aspects of early universe cosmology, and it is used to describe the interactions of elementary particles, the dynamics of many body systems and critical phenomena, all with exquisite accuracy. Currently, Perimeter researchers are producing worldleading advances in the study of integrability and scattering amplitudes in quantum field theories. String theory is a theoretical framework which was proposed to produce a unified description of all particles and forces in nature, including gravity. It is based on the idea that at very short distances, all particles should in fact be seen to be extended onedimensional objects, i.e., ‘strings.’ Modern string theory has grown to be a broad and varied field of research with strong connections to quantum gravity, particle physics and cosmology, as well as mathematics. An exciting new framework known as ‘holography’ has emerged from string theory whereby quantum gravity is formulated in terms of quantum field theory in one less dimension. This symbiosis between quantum field theory and quantum gravity has been a focus of many Perimeter researchers. This has led to the development of exciting new methods to study the quantum dynamics of gauge theories and in the application of these techniques to new domains, such as nuclear physics and condensed matter physics
Format results

12 talksCollection NumberC22043
Talk


QFT2  Quantum Electrodynamics  Afternoon Lecture
McMaster University 

QFT2  Quantum Electrodynamics  Afternoon Lecture
McMaster University 

QFT2  Quantum Electrodynamics  Afternoon Lecture
McMaster University 

QFT2  Quantum Electrodynamics  Afternoon Lecture
McMaster University


Quantum Fields and Strings 2021/2022
3 talksCollection NumberC22015Talk

Quantum Fields and Strings 2021/2022 Lecture 1
Perimeter Institute for Theoretical Physics 
Quantum Fields and Strings  Lecture 2
Perimeter Institute for Theoretical Physics 
Quantum Fields and Strings 2021/2022  Lecture 3
Perimeter Institute for Theoretical Physics


Octonions and the Standard Model
16 talksCollection NumberC21001Talk

Welcome and Opening Remarks
University of Nottingham 
Finite quantum geometry, octonions and the theory of fundamental particles.
University of ParisSaclay 
Supersymmetry and RCHO revisited
University of Cambridge 
Spin (8,9,10), Octonions and the Standard Model
University of Nottingham 
Gravity as the square of gauge theory
HeriotWatt University 
A Magic Pyramid of Supergravity Theories from YangMills Squared
Imperial College London 
Division algebraic symmetry breaking

Humboldt University of Berlin

Imperial College London


Clifford algebra of the Standard Model
Bulgarian Academy of Sciences


Tensor Networks: from Simulations to Holography III
21 talksCollection NumberC20034Talk

Tensor networks for LGT: beyond 1D
Max Planck Institute for Gravitational Physics  Albert Einstein Institute (AEI) 
Tensor networks for critical systems
Ghent University 
Tensor network models of AdS/qCFT
Freie Universität Berlin 
Ancilla qubit wavefunctions for the pseudogap metal phase of the cuprates
Harvard University 
Quantum Cellular Automata, Tensor Networks, and Area Laws
Max Planck Institute for Gravitational Physics  Albert Einstein Institute (AEI) 
Fun with replicas and holographic tensor networks
University of Amsterdam 
A tensornetwork approach to fixedpoint models of topological phases
Freie Universität Berlin 
Custom Fermionic Codes for Quantum Simulation
Dartmouth College


PSI 2019/2020  ChernSimons Theory (Part 1)
13 talksCollection NumberC20008Talk

PSI 2019/2020  ChernSimons Theory Part 1  Lecture 1
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  ChernSimons Theory Part 1  Lecture 2
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  ChernSimons Theory Part 1  Lecture 3
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  ChernSimons Theory Part 1  Lecture 4
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  ChernSimons Theory Part 1  Lecture 5
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  ChernSimons Theory Part 1  Lecture 6
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  ChernSimons Theory Part 1  Lecture 7
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  ChernSimons Theory Part 1  Lecture 8
Perimeter Institute for Theoretical Physics


PSI 2019/2020  QFT III
14 talksCollection NumberC20006Talk







PSI 2019/2020  QFT III  Lecture 7
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  QFT III  Lecture 8
Perimeter Institute for Theoretical Physics


Emmy Noether Workshop: The Structure of Quantum Space Time
25 talksCollection NumberC19047Talk

Welcome and Opening Remarks
Perimeter Institute for Theoretical Physics 
Quantum Spacetime from Lattice Gravity à la CDT
Radboud Universiteit Nijmegen 
How complement maps can cure divergences
University of Potsdam 
The gravitational Wilson loop and the nonAbelian Stokes' theorem
Okinawa Institute of Science and Technology Graduate University 
The dynamics of difference
Perimeter Institute for Theoretical Physics 
Quantum reference frames for space and time
ETH Zurich 
Probing fundamental physics with gravitational waves
Universidade Federal do ABC 
Implications of the Quantum Nature Spacetime for the Big Bang and Black Holes
Pennsylvania State University


PSI 2019/2020  Quantum Field Theory II (David)
16 talksCollection NumberC19042Talk

PSI 2019/2020  Quantum Field Theory (Wohns/Xu)
14 talksCollection NumberC19040Talk

PSI 2019/2020  Statistical Mechanics (Vieira)
14 talksCollection NumberC19041Talk

PSI 2019/2020  Statistical Mechanics (Vieira)
Perimeter Institute for Theoretical PhysicsPIRSA:19090119 
PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 2
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 3
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 4
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 5
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 6
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 7
Perimeter Institute for Theoretical Physics 
PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 8
Perimeter Institute for Theoretical Physics


Boundaries and Defects in Quantum Field Theory
21 talksCollection NumberC19035Talk

Symmetries and Dualities of Abelian TQFTs
Perimeter Institute for Theoretical Physics 
TBD
Stony Brook University 
Universality at large transverse spin in defect CFTs
European Organization for Nuclear Research (CERN) 
Domain Walls in SuperQCD
SISSA International School for Advanced Studies 
Weyl Anomaly Induced Current and Holography
Sun Yatsen University 
Wilson line impurities, flows and entanglement entropy
Swansea University 
Anomalies in the Space of Coupling Constants
Institute for Advanced Study (IAS) 
Integrability of onepoint functions in AdS/dCFT with and without supersymmetry
University of Copenhagen


Bootstrap 2019
11 talksCollection NumberC19026Talk

CFT amplitudes
SISSA International School for Advanced Studies 
Flux Tube Smatrix Bootstrap
European Organization for Nuclear Research (CERN) 
Precision Islands for ABJM theory from Mixed Correlator Bootstrap
Weizmann Institute of Science Canada 

Talk 13 via live stream
University of Oxford 
Spinning Conformal Bootstrap in 4d
L'Ecole Polytechnique Federale de Lausanne (EPFL) 
Talk 15 via live stream
Purdue University 
Talk 21 via live stream

California Institute of Technology

Institute for Advanced Study (IAS)



Special Topics in Physics  QFT2: Quantum Electrodynamics (Cliff Burgess)
12 talksCollection NumberC22043This course uses quantum electrodynamics (QED) as a vehicle for covering several more advanced topics within quantum field theory, and so is aimed at graduate students that already have had an introductory course on quantum field theory. Among the topics hoped to be covered are: gauge invariance for massless spin1 particles from special relativity and quantum mechanics; Ward identities; photon scattering and loops; UV and IR divergences and why they are handled differently; effective theories and the renormalization group; anomalies.

Quantum Fields and Strings 2021/2022
3 talksCollection NumberC22015This course covers three distinct topics: conformal field theory, anomalies, and string theory. The conformal field theory section of the course introduces conformal transformation and the conformal algebra, npoint functions in CFTs, and OPEs. The anomalies portion of the course focuses on the functional integral derivation of the chiral anomaly. The string theory part of the course derives the bosonic string spectrum and introduces Tduality and Dbranes. 
Octonions and the Standard Model
16 talksCollection NumberC21001Over 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.

Tensor Networks: from Simulations to Holography III
21 talksCollection NumberC20034 
PSI 2019/2020  ChernSimons Theory (Part 1)
13 talksCollection NumberC20008PSI 2019/2020  ChernSimons Theory (Part 1) 

Emmy Noether Workshop: The Structure of Quantum Space Time
25 talksCollection NumberC19047Understanding the smallscale structure of spacetime is one of the biggest challenges faced by modern theoretical physics. There are many different attempts to solve this problem and they reflect the diversity of approaches to quantum gravity. This workshop will bring together researchers from a wide range of quantum gravity approaches and give them an opportunity to exchange ideas and gain new insights.

PSI 2019/2020  Quantum Field Theory II (David)
16 talksCollection NumberC19042PSI 2019/2020  Quantum Field Theory II (David) 
PSI 2019/2020  Quantum Field Theory (Wohns/Xu)
14 talksCollection NumberC19040PSI 2019/2020  Quantum Field Theory (Wohns/Xu) 
PSI 2019/2020  Statistical Mechanics (Vieira)
14 talksCollection NumberC19041PSI 2019/2020  Statistical Mechanics (Vieira) 
Boundaries and Defects in Quantum Field Theory
21 talksCollection NumberC19035Boundaries and defects play central roles in quantum field theory (QFT) both as means to make contact with nature and as tools to constrain and understand QFT itself. Boundaries in QFT can be used to model impurities and also the finite extent of sample sizes while interfaces allow for different phases of matter to interact in a controllable way. More formally these structures shed light on the structure of QFT by providing new examples of dualities and renormalization group flows. Broadly speaking this meeting will focus on three areas: 1) formal and applied aspects of boundary and defect conformal field theory from anomalies and ctheorems to topological insulators 2) supersymmetry and duality from exact computations of new observables to the construction of new theories and 3) QFT in curved space and gravity from holographic computations of entanglement entropy to ideas in quantum information theory. Registration for this event is now open.

Bootstrap 2019
11 talksCollection NumberC19026Quantum field theory (QFT) is a universal language for theoretical physics describing the Standard Model gravity early universe inflation and condensed matter phenomena such as phase transitions superconductors and quantum Hall fluids. A triumph of 20th century physics was to understand weakly coupled QFTs: theories whose interactions can be treated as small perturbations of otherwise freely moving particles. However weakly coupled QFTs represent a tiny island in an ocean of possibilities. They cannot capture many of the most interesting and important physical phenomena from the strong nuclear force to high temperature superconductivity.The critical challenge for the 21st century is to understand and solve strongly coupled QFTs. Meeting this challenge will require new physical insight new mathematics and new computational tools. Our collaboration combines deep knowledge of novel nonperturbative techniques with a concrete plan for attacking the problem of strong coupling. The starting point is the astonishing discovery that in numerous physical systems there is a unique quantum field theory consistent with general principles of symmetry and quantum mechanics. By analyzing the full implications of these general principles one can make sharp predictions for physical observables without resorting to approximations.This strategy is called the Bootstrap the topic of this three week program.