# Video Library

Since 2002 Perimeter Institute has been recording seminars, conference talks, public outreach events such as talks from top scientists 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 and 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.

Accessibly by anyone with internet, Perimeter aims to share the power and wonder of science with this free library.

## PSI 2019/2020 - Relativity (Kubiznak) - Lecture 3

Thursday Sep 05, 2019
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## The antipodal identification as a new boundary condition on the horizon, and how it comes about

Thursday Sep 05, 2019
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Quantizing the black hole can be done without String Theory, fuzz balls, AdS/CFT and such. We just assume matter to keep the form of point particles until they come close to the horizon. The gravitational back reaction of these particles generates a novel relation between particles going in and particles going out, enabling us to transform in-going particles into out-going ones. This transformation removes "firewalls" along the future and past horizons, but it strongly affects space-time inside a black hole.

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## First Science Results from the EHT

Thursday Sep 05, 2019
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## PSI 2019/2020 - Quantum Theory (Branczyk) - Lecture 3

Thursday Sep 05, 2019
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## Discussion: Do cosmic tensions point to novel physics?

Wednesday Sep 04, 2019
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## Mutliplicative Bell inequalities

Wednesday Sep 04, 2019
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Bell inequalities are important tools in contrasting classical and quantum behaviors. To date, most Bell inequalities are linear combinations of statistical correlations between remote parties. Nevertheless, finding the classical and quantum mechanical (Tsirelson) bounds for a given Bell inequality in a general scenario is a difficult task which rarely leads to closed-form solutions. Here we introduce a new class of Bell inequalities based on products of correlators that alleviate these issues. Each such Bell inequality is associated with a non-cooperative coordination game.

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## The Planck Legacy: Inflation and the Origin of Structure in the Universe

Wednesday Sep 04, 2019
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## The Present Expansion rate of the Universe, Evidence of New Physics?

Wednesday Sep 04, 2019
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The Hubble constant remains one of the most important parameters in the cosmological model, setting the size and age scales of the Universe. Present uncertainties in the cosmological model including the nature of dark energy, the properties of neutrinos and the scale of departures from flat geometry can be constrained by measurements of the Hubble constant made to higher precision than was possible with the first generations of Hubble Telescope instruments.

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## CHIME: The Canadian Hydrogen Intensity Mapping Experiment

Wednesday Sep 04, 2019
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CHIME is a new interferometric telescope at radio frequencies 400-800 MHz. The mapping speed (or total statistical power) of CHIME is among the largest of any radio telescope in the world, and the technology powering CHIME could be used to build telescopes which are orders of magnitude more powerful.

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## Cosmology and fundamental physics with FRBs

Wednesday Sep 04, 2019
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FRBs are the only known sources of extragalactic coherent radiation, that show interference phenomena after traveling over cosmological distances. The interferometric probe allows equivalent strain measurements of $h\sim 10^{-26}$, opening new windows for gravitational wave detection, dark matter properties, and emission physics. I describe new directions, theoretical and observational tools, and current and future experiments.

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## Next Public Lecture

### GABRIELA GONZÁLEZ, LOUISIANA STATE UNIVERSITY

Wednesday Oct 23, 2019