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

27 talksCollection NumberC24028
Talk

Lecture  Celestial Holography Ia
PIRSA:24070002 
Lecture  Canonical a
PIRSA:24070003 
Lecture  Celestial Holography Ib
PIRSA:24070004 
Lecture  Amplitudes a
PIRSA:24070005 
Vision Talk
PIRSA:24070006 
Lecture  Celestial Holography IIa
PIRSA:24070007 
Lecture  Canonical b
PIRSA:24070008 
Lecture  Celestial Holography IIb
PIRSA:24070009


String Theory 2023/24
13 talksCollection NumberC24025Talk

String Theory Lecture
Perimeter Institute for Theoretical Physics 
String Theory Lecture
Perimeter Institute for Theoretical Physics 
String Theory Lecture
Perimeter Institute for Theoretical Physics 
String Theory Lecture
Perimeter Institute for Theoretical Physics 
String Theory Lecture
Perimeter Institute for Theoretical Physics 
String Theory Lecture
Perimeter Institute for Theoretical Physics 
String Theory Lecture
Perimeter Institute for Theoretical Physics 
String Theory Lecture
Perimeter Institute for Theoretical Physics


QFT III 2023/24
13 talksCollection NumberC24010Talk

QFT III Lecture
Perimeter Institute for Theoretical Physics 
QFT III Lecture
Perimeter Institute for Theoretical Physics 
QFT III Lecture
Perimeter Institute for Theoretical Physics 
QFT III Lecture
Perimeter Institute for Theoretical Physics 
QFT III Lecture
Perimeter Institute for Theoretical Physics 
QFT III Lecture
Perimeter Institute for Theoretical Physics 
QFT III Lecture
Perimeter Institute for Theoretical Physics 
QFT III Lecture
Perimeter Institute for Theoretical Physics


Quantum Field Theory 2 2023/24
14 talksCollection NumberC23045Talk

Twisted Holography MiniCourse
6 talksCollection NumberC23050Talk

Twisted Holography MiniCourse  Lecture 20231102
Perimeter Institute for Theoretical Physics 
Twisted Holography MiniCourse  Lecture 20231109
Perimeter Institute for Theoretical Physics 
Twisted Holography MiniCourse  Lecture 20231116
Perimeter Institute for Theoretical Physics 
Twisted Holography MiniCourse  Lecture 20231123
Perimeter Institute for Theoretical Physics 
Twisted Holography MiniCourse  Lecture 20231130
Perimeter Institute for Theoretical Physics 
Twisted Holography MiniCourse  Lecture 20231214
Perimeter Institute for Theoretical Physics


Quantum Spectral Curve and Three Point Functions minicourse
5 talksCollection NumberC23049Talk

3pt function: No Q's
Perimeter Institute for Theoretical Physics 
Qfunctions in spin chains. QSC for spin chains
King's College London 
QSC definition in N=4
King's College London 
An explicit solution
King's College London 
3pt functions: Yes Q's
Perimeter Institute for Theoretical Physics


Quantum Field Theory 1 2023/24
13 talksCollection NumberC23044Talk

Strings 2023
30 talksCollection NumberC23001Talk

Opening Remarks
Perimeter Institute for Theoretical Physics 

Research Talk 2  Burns holography
Harvard University 
Research Talk 3  Swampland and a Unification of the Dark Sector
Harvard University 
Research Talk 4  A universal pattern at infinite field distance
Irene Valenzuela 
Challenge Talk 1  The Cosmic Neutrino Background: Its distribution on the surface of the Earth and its manipulation on laboratory scales
Perimeter Institute for Theoretical Physics 
Research Talk 5  Crossing beyond scattering amplitudes
Hofie Hannesdottir 


MiniCourse of Numerical Conformal Bootstrap
15 talksCollection NumberC23030Talk

Lecture 1: Introduction and Overview; Bootstrapping Ising mixed correlator

Università di Pisa
 Aike Liu




Lecture 2: Bootstrapping global symmetries. Cutting surface algorithm
Università di Pisa 





Quantum Field Theory in Curved Spacetime
7 talksCollection NumberC23031Talk

Quantum Field Theory in Curved Spacetime (AM)  20230303
McMaster University 
Quantum Field Theory in Curved Spacetime (PM)  20230303
McMaster University 
Quantum Field Theory in Curved Spacetime (PM)  20230310
McMaster University 
Quantum Field Theory in Curved Spacetime (PM)  20230317
McMaster University 
Quantum Field Theory in Curved Spacetime (PM)  20230324
McMaster University 
Quantum Field Theory in Curved Spacetime (PM)  20230331
McMaster University 


Special Topics in Physics  QFT2: Quantum Electrodynamics (Cliff Burgess)
12 talksCollection NumberC22043Talk


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


Celestial Holography Summer School 2024
27 talksCollection NumberC24028Perimeter Institute is happy to host the inaugural summer school for the Simons Collaboration on Celestial Holography July 2226 in Waterloo, ON. The program will feature lectures on background material relevant for graduate students and postdocs interested in this emerging subfield, paired with vision talks on exciting future research directions.
:: :: ::

String Theory 2023/24
13 talksCollection NumberC24025The course covers the basics of String Theory: bosonic strings, Dbranes, a bit of superstrings.

QFT III 2023/24
13 talksCollection NumberC24010This survey course introduces some advanced topics in quantum field theory and string theory. Topics may include anomalies, conformal field theory, and bosonic string theory and are subject to change depending on the topics covered in the TBD elective course.


Twisted Holography MiniCourse
6 talksCollection NumberC23050This minicourse will introduce twisted holography, which is holography for BPS subsectors of gauge theory and gravity. We will start by introducing the Bmodel topological string from the spacetime perspective, before discussing branes, backreaction, and the holographic duality.
Zoom: https://pitp.zoom.us/j/98839130613?pwd=SExFK0ZVYzJ3NmJhU1RFa21PWU1qQT09

Quantum Spectral Curve and Three Point Functions minicourse
5 talksCollection NumberC23049In this minicourse we will describe some recent integrability developments in N=4 SYM. Pedro will start with some overview of three point functions in this theory. Paul will introduce the powerful Quantum Spectral Curve formalism describing the full planar spectrum of N=4 SYM starting with some elementary spin chain introduction. In this formalism, each operator in the theory is governed by a (set of) Qfunction(s). In his last lecture Paul will walk us through an explicit example from beginning to end of a QSC solution. Pedro will then describe some explorations on three point correlation functions in this theory. The goal would be to have a machine where three Qfunctions are given as input and a threepoint function is spit out as output. We will describe where we are in this quest.
No Zoom link or hybrid participation available. Registration is not required.


Strings 2023
30 talksCollection NumberC23001The Perimeter Institute for Theoretical Physics is delighted to host the 33rd installment of Strings, the flagship annual conference for the extended string theory community.
Strings 2023 will take place at PI July 2429. Capacity is limited to 200 inperson attendees. The programming will incorporate an interactive simulcast for virtual attendees.Recorded talks: https://pirsa.org/C23001
Organizing Committee: Sabrina Pasterski,* Freddy Cachazo, Kevin Costello, Davide Gaiotto, Jaume Gomis, Rob Myers, Pedro Vieira, & Alex Buchel.
Territorial Land Acknowledgement
Perimeter Institute acknowledges that it is situated on the traditional territory of the Anishinaabe, Haudenosaunee, and Neutral peoples.
Perimeter Institute is located on the Haldimand Tract. After the American Revolution, the tract was granted by the British to the Six Nations of the Grand River and the Mississaugas of the Credit First Nation as compensation for their role in the war and for the loss of their traditional lands in upstate New York. Of the 950,000 acres granted to the Haudenosaunee, less than 5 percent remains Six Nations land. Only 6,100 acres remain Mississaugas of the Credit land.

MiniCourse of Numerical Conformal Bootstrap
15 talksCollection NumberC23030This school will be an advanced course on the numerical bootstrap. In the lectures, we will discuss advanced theoretical aspects of numerical bootstrap and algorithms. In the tutorials, we will demonstrate how to use simpleboot/hyperion and help the participants to run bootstrap computation on their own clusters. Main examples are 3D Ising, O(2), O(3), GrossNeveuYukawa CFTs.
The school will consist of one lecture in the morning and two tutorials in the afternoon (one tutorial for simpleboot (by Ning Su) and another one for hyperion (by Aike Liu).
Course materials, including tutorials, slides, and sample codes, can be found at https://gitlab.com/AikeLiu/BootstrapMiniCourse
This event is supported by the Simons Collaboration on The Nonperturbative Bootstrap (https://bootstrapcollaboration.com/).
Territorial Land Acknowledgement
Perimeter Institute acknowledges that it is situated on the traditional territory of the Anishinaabe, Haudenosaunee, and Neutral peoples.
Perimeter Institute is located on the Haldimand Tract. After the American Revolution, the tract was granted by the British to the Six Nations of the Grand River and the Mississaugas of the Credit First Nation as compensation for their role in the war and for the loss of their traditional lands in upstate New York. Of the 950,000 acres granted to the Haudenosaunee, less than 5 percent remains Six Nations land. Only 6,100 acres remain Mississaugas of the Credit land.
We thank the Anishinaabe, Haudenosaunee, and Neutral peoples for hosting us on their land.

Quantum Field Theory in Curved Spacetime
7 talksCollection NumberC23031The course is an introduction to quantum field theory in curved spacetime. Upon building up the general formalism, the latter is applied to several topics in the modern theory of gravity and cosmology where the quantum properties of fundamental fields play an essential role.
Topics to be covered:
1) Radiation of particles by moving mirrors
2) Hawking radiation of black holes
3) Production of primordial density perturbations and gravity waves during inflation
4) Statistical properties of the primordial spectra
Required prior knowledge:
Foundations of quantum mechanics and general relativity 
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.