# 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.

## THE SM HIGGS VACUUM INSTABILITY, INFLATION AND THE FATE OF OUR UNIVERSE

Thursday Mar 26, 2015
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The presence of an instability in the Standard Model Higgs potential may have important implications for inflation and the viability of our Universe. In particular, if the Hubble scale during inflation is comparable to (or larger than) the instability scale of the potential, quantum fluctuations in the Higgs field will lead to the Higgs sampling the unstable part of the potential during inflation. However, to correctly study transitions to the unstable regime and determine the significance for the resulting universe requires addressing a number of subtleties.

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## Explorations in Condensed Matter-9

Thursday Mar 26, 2015
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## Explorations in Quantum Information-9

Thursday Mar 26, 2015
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## Quantum fluctuation theorems in open systems

Wednesday Mar 25, 2015
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For isolated quantum systems fluctuation theorems are commonly derived within the two-time energy measurement approach. In this talk we will discuss recent developments and studies on generalizations of this approach. We will show that concept of fluctuation theorems is not only of thermodynamic relevance, but that it is also of interest in quantum information theory. In a second part we will show that the quantum fluctuation theorem generalizes to PT-symmetric quantum mechanics with unbroken PT-symmetry.

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## Galileons and their generalizations

Wednesday Mar 25, 2015
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Galileons are higher-derivative effective field theories with curious properties which have attracted much recent interest among cosmologists.  I will review their origins, their properties, their generalizations, and some recent developments.

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## Explorations in Condensed Matter-8

Wednesday Mar 25, 2015
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## Explorations in Quantum Information-8

Wednesday Mar 25, 2015
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## The (macro)-reality of superpositions

Tuesday Mar 24, 2015
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This talk touches on three questions regarding the ontological status of quantum states using the ontological models

framework: it is assumed that a physical system has some underlying ontic state and that quantum states correspond to probability distributions over these ontic states.

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## Tensor algebra made easy with Mathematica

Tuesday Mar 24, 2015
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Calculations in General Relativity inevitably involve tricky manipulations of tensor equations. In many cases, the tensor algebra involved is at best tedious and fraught with error, and at worst impossible. It is, however, ideally suited to implementation in a computer algebra system such as Mathematica. In this talk I will show how the xAct tensor algebra package can be used to make light work of difficult tensor calculations.

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## Anthropic Origin of the Neutrino Mass from Cooling Failure

Tuesday Mar 24, 2015
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Given a large landscape of vacua that statistically favors large values of the neutrino mass sum, $m_\nu$, I will present the probability distribution over $m_\nu$ obtained by weighting this prior by the amount of galaxies that are produced. Using Boltzmann codes to compute the smoothed density contrast on Mpc scales, we find that large dark matter halos form abundantly for $m_\nu \gtrsim 10$\,eV. However, in this regime structure forms late and is dominated by cluster scales, as in a top-down scenario.

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## Next Public Lecture

### Amanda Peet, University of Toronto and Perimeter Institute

Wednesday May 06, 2015

## RECENT PUBLIC LECTURE

### The Most Wanted Particle

Speaker: Jon Butterworth