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

21 talksCollection Number C20034
Talk

Tensor networks for LGT: beyond 1D
MariCarmen Banuls Max Planck Institute for Gravitational Physics  Albert Einstein Institute (AEI)

Tensor networks for critical systems
Frank Verstraete Ghent University

Tensor network models of AdS/qCFT
Jens Eisert Freie Universität Berlin


Quantum Cellular Automata, Tensor Networks, and Area Laws
Ignacio Cirac Max Planck Institute for Gravitational Physics  Albert Einstein Institute (AEI)

Fun with replicas and holographic tensor networks
Michael Walter University of Amsterdam

A tensornetwork approach to fixedpoint models of topological phases
Andreas Bauer Freie Universität Berlin

Custom Fermionic Codes for Quantum Simulation
Riley Chien Dartmouth College


PSI 2019/2020  ChernSimons Theory (Part 1)
13 talksCollection Number C20008Talk

PSI 2019/2020  ChernSimons Theory Part 1  Lecture 1
Kevin Costello Perimeter Institute for Theoretical Physics

PSI 2019/2020  ChernSimons Theory Part 1  Lecture 2
Kevin Costello Perimeter Institute for Theoretical Physics

PSI 2019/2020  ChernSimons Theory Part 1  Lecture 3
Kevin Costello Perimeter Institute for Theoretical Physics

PSI 2019/2020  ChernSimons Theory Part 1  Lecture 4
Kevin Costello Perimeter Institute for Theoretical Physics

PSI 2019/2020  ChernSimons Theory Part 1  Lecture 5
Kevin Costello Perimeter Institute for Theoretical Physics

PSI 2019/2020  ChernSimons Theory Part 1  Lecture 6
Kevin Costello Perimeter Institute for Theoretical Physics

PSI 2019/2020  ChernSimons Theory Part 1  Lecture 7
Kevin Costello Perimeter Institute for Theoretical Physics

PSI 2019/2020  ChernSimons Theory Part 1  Lecture 8
Kevin Costello Perimeter Institute for Theoretical Physics


PSI 2019/2020  QFT III
14 talksCollection Number C20006Talk







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

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


Emmy Noether Workshop: The Structure of Quantum Space Time
25 talksCollection Number C19047Talk

Welcome and Opening Remarks
Bianca Dittrich Perimeter Institute for Theoretical Physics

Quantum Spacetime from Lattice Gravity à la CDT
Renate Loll Radboud Universiteit Nijmegen

How complement maps can cure divergences
Sylvie Paycha Universität Potsdam

The gravitational Wilson loop and the nonAbelian Stokes' theorem
Reiko Toriumi Okinawa Institute of Science and Technology (OIST)

The dynamics of difference
Lee Smolin Perimeter Institute for Theoretical Physics


Probing fundamental physics with gravitational waves
Cecilia Chirenti Universidade Federal do ABC

Implications of the Quantum Nature Spacetime for the Big Bang and Black Holes
Abhay Ashtekar Pennsylvania State University


PSI 2019/2020  Quantum Field Theory II (David)
16 talksCollection Number C19042Talk

PSI 2019/2020  Statistical Mechanics (Vieira)
14 talksCollection Number C19041Talk

PSI 2019/2020  Statistical Mechanics (Vieira)
Pedro Vieira Perimeter Institute for Theoretical Physics
PIRSA:19090119 
PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 2
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 3
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 4
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 5
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 6
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 7
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2019/2020  Statistical Mechanics (Vieira)  Lecture 8
Pedro Vieira Perimeter Institute for Theoretical Physics


PSI 2019/2020  Quantum Field Theory (Wohns/Xu)
14 talksCollection Number C19040Talk

Boundaries and Defects in Quantum Field Theory
21 talksCollection Number C19035Talk

Symmetries and Dualities of Abelian TQFTs
Jaume Gomis Perimeter Institute for Theoretical Physics

TBD
Leonardo Rastelli Stony Brook University

Universality at large transverse spin in defect CFTs
Madalena Lemos European Organization for Nuclear Research (CERN)

Domain Walls in SuperQCD
Francesco Benini SISSA International School for Advanced Studies

Weyl Anomaly Induced Current and Holography
RongXin Miao Sun YatSen University

Wilson line impurities, flows and entanglement entropy
Prem Kumar Swansea University

Anomalies in the Space of Coupling Constants
Nathan Seiberg Institute for Advanced Study (IAS)



Bootstrap 2019
11 talksCollection Number C19026Talk

CFT amplitudes
Marc Gillioz SISSA International School for Advanced Studies

Flux Tube Smatrix Bootstrap
Andrea Guerrieri Perimeter Institute for Theoretical Physics

Precision Islands for ABJM theory from Mixed Correlator Bootstrap
Shai Chester Weizmann Institute of Science Canada


Talk 13 via live stream
Carlo Meneghelli University of Oxford

Spinning Conformal Bootstrap in 4d
Denis Karteev L'Ecole Polytechnique Federale de Lausanne (EPFL)

Talk 15 via live stream
Martin Kruczenski Purdue University

Talk 21 via live stream

Walter Landry California Institute of Technology

David SimmonsDuffin Institute for Advanced Study (IAS)



PSI 2018/2019  String Theory Review (Gaiotto)
15 talksCollection Number C19015Talk

PSI 2018/2019  String Theory Review  Lecture 1
Davide Gaiotto Perimeter Institute for Theoretical Physics

PSI 2018/2019  String Theory Review  Lecture 2
Davide Gaiotto Perimeter Institute for Theoretical Physics

PSI 2018/2019  String Theory Review  Lecture 3
Davide Gaiotto Perimeter Institute for Theoretical Physics

PSI 2018/2019  String Theory Review  Lecture 4
Davide Gaiotto Perimeter Institute for Theoretical Physics

PSI 2018/2019  String Theory Review  Lecture 5
Davide Gaiotto Perimeter Institute for Theoretical Physics

PSI 2018/2019  String Theory Review  Lecture 6
Davide Gaiotto Perimeter Institute for Theoretical Physics

PSI 2018/2019  String Theory Review  Lecture 7
Davide Gaiotto Perimeter Institute for Theoretical Physics

PSI 2018/2019  String Theory Review  Lecture 8
Davide Gaiotto Perimeter Institute for Theoretical Physics


Gauge Theory, Geometric Langlands and Vertex Operator Algebras
11 talksCollection Number C18004Talk

Gauge Theory, Geometric Langlands, and All That
Edward Witten Institute for Advanced Study (IAS)  School of Natural Sciences (SNS)

Overview of the global Langlands correspondence
Dima Arinkin University of WisconsinMilwaukee

Gauge theory, vertex algebras and quantum Geometric Langland dualities
Davide Gaiotto Perimeter Institute for Theoretical Physics


Introduction to local geometric Langlands
Sam Raskin The University of Texas at Austin





Quantum Black Holes in the Sky?
34 talksCollection Number C17055Talk

Quantifying the evidence for black holes with GW and EM probes
Paolo Pani Instituto Superior Tecnico  Departamento de Física

Echoes from the Abyss: Tentative Evidence for PlanckScale Structure at Black Hole Horizons
Jahed Abedi University of Stavanger (UiS)

Improvements on the methods for searching echoes
Julian Westerweck Albert Einstein Institute

A modelindependent search for gravitationalwave echoes
Archisman Ghosh Institucio Catalana de Recerca I Estudis Avancats (ICREA)  Universitat de Barcelona

An alternative significance estimation for the evidence for echoes
Alex Nielsen Albert Einstein Institute

Discussion: Evidence for Echoes
PIRSA:17110074 
Inspiral Tests of Strongfield Gravity and Ringdown Tests of Quantum Black Holes
Kent Yagi University of Virginia

A Recipe for Echoes
Aaron Zimmerman The University of Texas at Austin


Tensor Networks: from Simulations to Holography III
21 talksCollection Number C20034 
PSI 2019/2020  ChernSimons Theory (Part 1)
13 talksCollection Number C20008PSI 2019/2020  ChernSimons Theory (Part 1) 

Emmy Noether Workshop: The Structure of Quantum Space Time
25 talksCollection Number C19047Understanding 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 Number C19042PSI 2019/2020  Quantum Field Theory II (David) 
PSI 2019/2020  Statistical Mechanics (Vieira)
14 talksCollection Number C19041PSI 2019/2020  Statistical Mechanics (Vieira) 
PSI 2019/2020  Quantum Field Theory (Wohns/Xu)
14 talksCollection Number C19040PSI 2019/2020  Quantum Field Theory (Wohns/Xu) 
Boundaries and Defects in Quantum Field Theory
21 talksCollection Number C19035Boundaries 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 Number C19026Quantum 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.

PSI 2018/2019  String Theory Review (Gaiotto)
15 talksCollection Number C19015PSI 2018/2019  String Theory Review (Gaiotto) 
Gauge Theory, Geometric Langlands and Vertex Operator Algebras
11 talksCollection Number C18004The workshop will explore the relation between boundary conditions in fourdimensional gauge theory the Geometric Langlands program and Vertex Operator Algebras.

Quantum Black Holes in the Sky?
34 talksCollection Number C17055The past decade has witnessed significant breakthroughs in understanding the quantum nature of black holes, with insights coming from quantum information theory, numerical relativity, and string theory. At the same time, astrophysical and gravitational wave observations can now provide an unprecedented window into the phenomenology of black hole horizons. This workshop seeks to bring together leading experts in these fields to explore new theoretical and observational opportunities and synergies that could improve our physical understanding of quantum black holes.