# 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.

## Reconstructing the Universe with secondary CMB anisotropies

Wednesday Feb 20, 2019
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The cosmic microwave background radiation has been an indispensable tool for learning about the origins and evolution of our Observable Universe. Satellites and ground based experiments measuring the temperature and polarization anisotropies with ever increasing angular resolution and sensitivity have established the standard cosmological model, LCDM, and constrained or ruled out a huge variety of theoretical models of the early Universe.

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## Coulomb Phases and Anomalies: Geometric Approach to 5d/6d Theories

Wednesday Feb 20, 2019
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I will review the geometric approach to the description of Coulomb branches and Chern-Simons terms of gauge theories coming from compactifications of M-theory on elliptically fibered Calabi-Yau threefolds. Mathematically, this involves finding all the crepant resolutions of a given Weierstrass model and understanding the network of flops connecting them together with computing certain topological invariants. I will further check that the uplifted theory in 6d is anomaly-free using Green-Schwartz mechanism.

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## Quantum Fields and Strings Seminar

Tuesday Feb 19, 2019
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Seminar given remotely.

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## Topological Holography Course - Lecture 2

Friday Feb 15, 2019
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## PSI 2018/2019 - Gravitational Physics - Lecture 14

Friday Feb 15, 2019
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## PSI 2018/2019 - Standard Model Review - Lecture 13

Friday Feb 15, 2019
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## PSI 2018/2019 - Gravitational Physics - Lecture 13

Thursday Feb 14, 2019
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## PSI 2018/2019 - Gravitational Physics - Lecture 12

Thursday Feb 14, 2019
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## PSI 2018/2019 - Standard Model Review - Lecture 12

Thursday Feb 14, 2019
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## Decay of correlations in long-range interacting systems at non-zero temperature

Wednesday Feb 13, 2019

We study correlations in fermionic systems with long-range interactions in thermal equilibrium. We prove an upper-bound on the correlation decay between anti-commut-ing operators based on long-range Lieb-Robinson type bounds. Our result shows that correlations between such operators in fermionic long-range systems of spatial dimension $D$ with at most two-site interactions decaying algebraically with the distance with an exponent $\alpha \geq 2\,D$, decay at least algebraically with an exponent arbitrarily close to $\alpha$.

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## Next Public Lecture

Check back for details on the next lecture in Perimeter's Public Lectures Series

## LECTURES ON-DEMAND

### Jocelyn Bell Burnell: University of Oxford

Speaker: Jocelyn Bell Burnell