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

34 talksCollection Number C17055
Talk

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


PSI 2017/2018  Quantum Field Theory I (Wohns, Ali)
14 talksCollection Number C17038Talk

PSI 2017/2018  Quantum Field Theory I  Lecture 1
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:17100020 
PSI 2017/2018  Quantum Field Theory I  Lecture 2
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:17100021 
PSI 2017/2018  Quantum Field Theory I  Lecture 3
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:17100022 
PSI 2017/2018  Quantum Field Theory I  Lecture 4
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:17100023 
PSI 2017/2018  Quantum Field Theory I  Lecture 5
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:17100024 
PSI 2017/2018  Quantum Field Theory I  Lecture 6
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:17100025 
PSI 2017/2018  Quantum Field Theory I  Lecture 7
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:17100026 
PSI 2017/2018  Quantum Field Theory I  Lecture 8
Dan Wohns Perimeter Institute for Theoretical Physics
PIRSA:17100027


Tensor Networks for Quantum Field Theories II
18 talksCollection Number C17011Talk

Discretizing the manyelectron Schrodinger Equation
Steven White University of California, Irvine

Emergence of conformal symmetry in critical spin chains
Ashley Milsted California Institute of Technology



Bridging Perturbative Expansions with Tensor Networks
Jutho Haegeman Ghent University

The continuous multiscale entanglement renormalization ansatz (cMERA)
Guifre Vidal Alphabet (United States)

Unitary Networks from the Exact Renormalization of Wavefunctionals
Rob Leigh University of Illinois UrbanaChampaign

Tensor networks and Legendre transforms
Brian Swingle Brandeis University


It from Qubit Summer School
62 talksCollection Number C16003Talk


QI Basics  1
Patrick Hayden Stanford University

Gravity Basics  1
Veronika Hubeny University of California, Davis

Entanglement  1
Robert Spekkens Perimeter Institute for Theoretical Physics

GR: Actions and Equations
David Kubiznak Charles University

A new perspective on holographic entanglement
Matthew Headrick Brandeis University

Bell’s Theorem
Adrian Kent University of Cambridge

QFT Basics  1
Thomas Hartman Cornell University


Quantum Information in Quantum Gravity II
31 talksCollection Number C15041Talk

Gravity Dual of Quantum Information Metric
Tadashi Takayanagi Yukawa Institute for Theoretical Physics

A new perspective on holographic entanglement
Matthew Headrick Brandeis University

Universal holographic description of CFT entanglement entropy
Thomas Faulkner University of Illinois UrbanaChampaign

Geometric Constructs in AdS/CFT
Veronika Hubeny University of California, Davis

Do black holes create polyamory
Jonathan Oppenheim University College London

Tensor Network Renormalization and the MERA
Glen Evenbly Georgia Institute of Technology

Entanglement renormalization for quantum fields
Jutho Haegeman Ghent University

Holographic quantum errorcorrecting codes: Toy models for the bulk/boundary correspondence
Fernando Pastawski California Institute of Technology


PSi 2014/2015  Explorations in String Theory (Vieira)
15 talksCollection Number C15012Talk

PSI 2014/2015  Explorations in String Theory  Lecture 1
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2014/2015  Explorations in String Theory  Lecture 2
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2014/2015  Explorations in String Theory  Lecture 3
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2014/2015  Explorations in String Theory  Lecture 4
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2014/2015  Explorations in String Theory  Lecture 5
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2014/2015  Explorations in String Theory  Lecture 6
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2014/2015  Explorations in String Theory  Lecture 7
Pedro Vieira Perimeter Institute for Theoretical Physics

PSI 2014/2015  Explorations in String Theory  Lecture 8
Pedro Vieira Perimeter Institute for Theoretical Physics


String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics

Multiloop Null Polygons from Fishnet theory to N=4 SYM
Enrico Olivucci 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

Double Scaled SYK and de Sitter Holography
Herman Verlinde Princeton University

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.

PSI 2017/2018  Quantum Field Theory I (Wohns, Ali)
14 talksCollection Number C17038PSI 2017/2018  Quantum Field Theory I (Wohns, Ali) 
Tensor Networks for Quantum Field Theories II
18 talksCollection Number C17011Tensor Networks for Quantum Field Theories II 

Quantum Information in Quantum Gravity II
31 talksCollection Number C15041Quantum Information in Quantum Gravity II 
PSi 2014/2015  Explorations in String Theory (Vieira)
15 talksCollection Number C15012Review of selected topics in String Theory.

String Theory Lecture
Davide Gaiotto Perimeter Institute for Theoretical Physics

Multiloop Null Polygons from Fishnet theory to N=4 SYM
Enrico Olivucci Perimeter Institute for Theoretical Physics
"Null Polygons" in N=4 SYM theory describe the multipoint correlators of 1/2BPS local operators with large Rcharge, when they approach the vertices of a lightlike polygon. The leading UV divergences of null polygons is conjectured to satisfy a hierarchy of coupled Toda field theory equations [E.O., Vieira ’22]. I will present some progress towards the prediction of Null Polygons beyond leading logarithms via the hexagons technique, appropriately truncated in the lightcone regime. The method, still conjectural, relies on a series of weakcoupling derivations performed in the Fishnet limit of the theory, where the hexagon representation is derived in the basis of eigenfunctions of a conformal Heisenberg magnet in the principal series. I will present a number of workedout examples for multipoint multiloop Fishnet Feynman integrals and Null Polygons.


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

Double Scaled SYK and de Sitter Holography
Herman Verlinde Princeton University
In this talk I will describe the correspondence between the double scaling limit of the SYK model and infinite temperature and de Sitter gravity in 2 and 3 dimensions. The dictionary involves a precise match between the chord rules that govern the SYK correlation functions and the braid interactions between line operators in the gravity theory.
