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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.

## 13/14 PSI - Condensed Matter - Lecture 3

Wednesday Nov 13, 2013
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## 13/14 PSI - Quantum Field Theory II - Lecture 3

Wednesday Nov 13, 2013
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## General Relativity for Cosmology - Lecture 17

Tuesday Nov 12, 2013
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## Quantum mechanics as an operationally time symmetric probabilistic theory

Tuesday Nov 12, 2013
Speaker(s):

The standard formulation of quantum mechanics is
operationally asymmetric with respect to time reversal---in the language of
compositions of tests, tests in the past can influence the outcomes of test in
the future but not the other way around. The question of whether this represents
a fundamental asymmetry or it is an artifact of the formulation is not a new
one, but even though various arguments in favor of an inherent symmetry have
been made, no complete time-symmetric formulation expressed in rigorous

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## On Scale and Conformal Invariance in Four Dimensions

Tuesday Nov 12, 2013
Speaker(s):

I will be discussing
relation between scale and conformal symmetry in unitary Lorentz invariant QFTs in four dimensions.

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## Baryogenesis from WIMPs

Tuesday Nov 12, 2013

We propose a robust, unified framework, in which the similar baryon and dark matter cosmic abundances both arise from the physics of weakly interacting massive particles (WIMPs), with the rough quantitative success of the so-called “WIMP miracle”. In particular the baryon asymmetry arises from the decay of a meta-stable WIMP after its thermal freezeout at or below the weak scale. A minimal model and its embedding in R-parity violating (RPV) natural SUSY are studied as examples. The new mechanism saves RPV SUSY from the potential crisis of washing out primordial baryon asymmetry.

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## Is there evidence for additional neutrino species from cosmology?

Tuesday Nov 12, 2013
Speaker(s):

It has been suggested that recent cosmological and
flavor-oscillation data favor the existence of additional neutrino species
beyond the three standard flavors. We apply Bayesian model selection to
determine whether there is any evidence from current cosmological datasets for
the standard cosmological model to be extended to include additional neutrino
flavors. The datasets employed include cosmic microwave background temperature,
polarization and lensing data, and measurements of the baryon acoustic

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## 13/14 PSI - Condensed Matter - Lecture 2

Tuesday Nov 12, 2013
Speaker(s):
Collection/Series:

## 13/14 PSI - Quantum Field Theory II - Lecture 2

Tuesday Nov 12, 2013
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## A universal Hamiltonian simulator: the full characterization

Monday Nov 11, 2013
Speaker(s):

We show that if the ground state energy problem of a
classical spin model is NP-hard, then there exists a choice parameters of the
model such that its low energy spectrum coincides with the spectrum of
\emph{any} other model, and, furthermore, the corresponding eigenstates match
on a subset of its spins. This implies that all spin physics, for example all
possible universality classes, arise in a single model. The latter property was
recently introduced and called Hamiltonian completeness'', and it was shown

## RECENT PUBLIC LECTURE

### Staring into the Abyss

Speaker: Avery Broderick