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Video Library

Since 2002 Perimeter Institute has been recording seminars, conference talks, and public outreach events using video cameras installed in our lecture theatres.  Perimeter now has 7 formal presentation spaces for its many scientific conferences, seminars, workshops and educational outreach activities, all with advanced audio-visual technical capabilities.  Recordings of events in these areas are all available On-Demand from this Video Library and on Perimeter Institute Recorded Seminar Archive (PIRSA)PIRSA is a permanent, free, searchable, and citable archive of recorded seminars from relevant bodies in physics. This resource has been partially modelled after Cornell University's arXiv.org.

A Web of Dualities in Condensed Matter Physics: from Quantum Hall Effect to Exotic Quantum Criticality

Mercredi oct 04, 2017
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Two seemingly different quantum field theories may secretly describe the same underlying physics — a phenomenon known as “duality". I will review some recent developments in field theory dualities in (2+1) dimensions and some of their applications in condensed matter physics, in particular in quantum Hall effect and quantum phase transitions.

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Beyond Geometric Invariant Theory

Mercredi oct 04, 2017

Geometric invariant theory (GIT) is an essential tool for constructing moduli spaces in algebraic geometry. Its advantage, that the construction is very concrete and direct, is also in some sense a draw-back, because semistability in the sense of GIT is often more complicated to describe than related intrinsic notions of semistability in moduli problems. Recently a theory has emerged which treats the results and structures of geometric invariant theory in a broader context.

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General Relativity for Cosmology - Lecture 8

Mardi oct 03, 2017
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Self-testing and the geometry of the quantum set

Mardi oct 03, 2017
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Device-independent self-testing allows user to identify the measured quantum states and the measurements made in a device using the observed statistics. Such verification scheme only requires assuming the validity of quantum theory and no-signalling. As such, no assumptions are required about the inner-workings of the device.

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Dynamics of Quantum Chromodynamics in 2+1 Dimensions

Mardi oct 03, 2017
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We review recent developments concerning the dynamics of QCD in 2+1 dimensions. We will discuss the phases of the theory depending on the matter representations and the Chern-Simons level. We present several new dualities and conjectures about the behaviour of these theories in their strongly coupled phases.

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Tunneling in Quantum Field Theory and the Ultimate Fate of our Universe

Mardi oct 03, 2017
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One of the most concrete implications of the discovery of the Higgs boson is that, in the absence of physics beyond the standard model, the long term fate of our universe can now be established through precision calculations. Are we in a metastable minimum of the Higgs potential or the true minimum? If we are in a metastable vacuum, what is its lifetime? To answer these questions, we need to understand tunneling in quantum field theory.

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Moore-Tachikawa conjecture, affine Grassmannian and Coulomb branches of star-shaped quivers

Lundi oct 02, 2017
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Moore and Tachikawa conjecture that there exists a functor from the category of 2-bordisms to a certain category whose objects are algebraic groups and morphisms between $G$ and $H$ are given by affine symplectic varieties with an action of $G\times H$.  I will explain a proof of this conjecture due to Ginsburg and Kazhdan, and its relation to Coulomb branches of certain quiver gauge theories which allows to make interesting calculations.

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Driven Phases of Quantum Matter

Lundi oct 02, 2017
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Clean and interacting periodically driven quantum systems are believed to exhibit a single, trivial “infinite-temperature” Floquet-ergodic phase. By contrast, I will show that their disordered Floquet many-body localized counterparts can exhibit distinct ordered phases with spontaneously broken symmetries delineated by sharp transitions. Some of these are analogs of equilibrium states, while others are genuinely new to the Floquet setting.

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General Relativity for Cosmology - Lecture 7

Vendredi sep 29, 2017
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Complex Quantum Tunneling, Picard-Lefschetz Theory, and the Decay of Black Holes

Jeudi sep 28, 2017
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Quantum effects render black holes unstable. In addition to Hawking radiation, which leads to the prediction of a long lifetime, there is the possibility of quantum tunneling of the black hole geometry itself. A robust possibility for treating the quantum tunneling of a spacetime geometry is through a complex path integral and Picard-Lefschetz theory.

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Next Public Lecture

NEIL TUROK: WE ARE INNOVATORS: A TALK ON THE POWER OF IDEAS

Mercredi oct 18, 2017

RECENT PUBLIC LECTURE

Erik Verlinde: A new view on gravity and the dark side of the cosmos

Speaker: Erik Verlinde