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

Collection Number C25013

Quantum Field Theory III, PHYS 777, February 24  March 28, 2025
Collection Number C25005 
Quantum Field Theory II (Core), PHYS 603, November 12  December 11, 2024
Collection Number C24035 
Quantum Field Theory I (Core), PHYS 601, October 7  November 6, 2024
Collection Number C24034 
Celestial Holography Summer School 2024
12 talksCollection Number C24028Talk

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 Number C24025Talk

String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics

String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics

String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics

String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics

String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics

String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics

String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics

String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics


QFT III 2023/24
13 talksCollection Number C24010Talk

QFT III Lecture
Jaume Gomis Perimeter Institute for Theoretical Physics

QFT III Lecture
Jaume Gomis Perimeter Institute for Theoretical Physics

QFT III Lecture
Jaume Gomis Perimeter Institute for Theoretical Physics

QFT III Lecture
Jaume Gomis Perimeter Institute for Theoretical Physics

QFT III Lecture
Jaume Gomis Perimeter Institute for Theoretical Physics

QFT III Lecture
Mykola Semenyakin Perimeter Institute for Theoretical Physics

QFT III Lecture
Mykola Semenyakin Perimeter Institute for Theoretical Physics

QFT III Lecture
Mykola Semenyakin Perimeter Institute for Theoretical Physics


Quantum Field Theory 2 2023/24
14 talksCollection Number C23045Talk

Twisted Holography MiniCourse
6 talksCollection Number C23050Talk

Twisted Holography MiniCourse  Lecture 20231102
Kevin Costello Perimeter Institute for Theoretical Physics

Twisted Holography MiniCourse  Lecture 20231109
Kevin Costello Perimeter Institute for Theoretical Physics

Twisted Holography MiniCourse  Lecture 20231116
Kevin Costello Perimeter Institute for Theoretical Physics

Twisted Holography MiniCourse  Lecture 20231123
Davide Gaiotto Perimeter Institute for Theoretical Physics

Twisted Holography MiniCourse  Lecture 20231130
Davide Gaiotto Perimeter Institute for Theoretical Physics

Twisted Holography MiniCourse  Lecture 20231214
Davide Gaiotto Perimeter Institute for Theoretical Physics


Quantum Spectral Curve and Three Point Functions minicourse
5 talksCollection Number C23049Talk

3pt function: No Q's
Pedro Vieira Perimeter Institute for Theoretical Physics

Qfunctions in spin chains. QSC for spin chains
Paul Ryan King's College London

QSC definition in N=4
Paul Ryan King's College London

An explicit solution
Paul Ryan King's College London

3pt functions: Yes Q's
Pedro Vieira Perimeter Institute for Theoretical Physics


Quantum Field Theory 1 2023/24
13 talksCollection Number C23044Talk

Strings 2023
30 talksCollection Number C23001Talk

Opening Remarks
Robert Myers Perimeter Institute for Theoretical Physics


Research Talk 2  Burns holography
Atul Sharma Harvard University

Research Talk 3  Swampland and a Unification of the Dark Sector
Cumrun Vafa 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
Savas Dimopoulos Perimeter Institute for Theoretical Physics

Research Talk 5  Crossing beyond scattering amplitudes
Hofie Hannesdottir 



Quantum Field Theory III, PHYS 777, February 24  March 28, 2025
Collection Number C25005The course will cover the basics of conformal field theories and also some applications, including exact computations of the critical exponents in 2d statistical models. 
Quantum Field Theory II (Core), PHYS 603, November 12  December 11, 2024
Collection Number C24035This course introduces the functional integral formalism, the renormalization group, and nonabelian gauge theory. Additional topics may be covered as time allows. 
Quantum Field Theory I (Core), PHYS 601, October 7  November 6, 2024
Collection Number C24034The first half of the course explains why fields are desirable when quantum mechanics meets special relativity. The second half introduces different kinds of spinor fields and their interactions. 
Celestial Holography Summer School 2024
12 talksCollection Number C24028Perimeter 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 Number C24025The course covers the basics of String Theory: bosonic strings, Dbranes, a bit of superstrings.

QFT III 2023/24
13 talksCollection Number C24010This 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 Number C23050This 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 Number C23049In 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 Number C23001The 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.