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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.

## Numrelasticity

Vendredi juin 24, 2011
Speaker(s):

Nonlinear numerical relativistic elasticity may be necessary for simulations including neutron star crusts. Basic simulations of large deformations in relativistic elastic matter will be detailed, and issues necessary for more realistic simulations covered. This work is in collaboration with Carsten Gundlach.

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## Challenges in Cosmology

Vendredi juin 24, 2011
Speaker(s):

An attempt at describing some of the shortcomings in our present understanding of cosmology.

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## Relativistic Magnetohydrodynamic Bondi--Hoyle Accretion

Vendredi juin 24, 2011
Speaker(s):

I present a relativistic study of axisymmetric magnetohydrodynamic Bondi--Hoyle accretion onto a moving Kerr black hole. The equations of general relativistic magnetohydrodynamics are solved using high resolution shock capturing methods, involving the use of linearised Riemann solvers. In this study I use the ideal MHD limit, which assumes no viscosity and infinite conductivity. The fluid flow is completely specified by the adiabatic constant $Gamma$, the asymptotic speed of sound $c_s^infty$, and the plasma beta parameter $beta_P$.

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## Modeling QPOs in magnetar giant flares

Vendredi juin 24, 2011
Speaker(s):

Alfven oscillations of strongly magnetized neutron stars coupled to shear modes in the solid crust could possibly explain the quasi-periodic oscillations (QPOs) observed in the giant flares of soft gamma repeaters. We present results of two-dimensional simulations of Alfven torsional oscillations in magnetars, modeled as relativistic stars with a dipolar magnetic field. We use a general relativistic magnetohydrodynamics code in the anelastic approximation, which allows for an effective suppression of fluid modes and an accurate description of the Alfven waves.

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## A toy model of quantum gravity in cosmological spacetimes

Vendredi juin 24, 2011
Speaker(s):

In this talk, I attempt to gain insight into the description of quantum gravity on cosmological spacetimes by considering the physics of families of accelerating observers in spacetimes which admit non-perturbative descriptions vis AdS/CFT.

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## Combining MHD and microphysics

Vendredi juin 24, 2011
Speaker(s):

I will discuss the techniques that can be used to include arbitrary equations of state in MHD simulations, particularly the ways in which one may perform conservative to primitive variable conversion numerically for such simulations.

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## Complexity in Fundamental Physics

Jeudi juin 23, 2011
Speaker(s):
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## Using GPUs to accelerate molecular dynamics simulations

Jeudi juin 23, 2011
Speaker(s):

GPUs can offer a less costly solution to large-scale calculations of astrophysical systems. I will outline the basics of the CUDA libraries and also compare with various metrics our in-development GPU code for molecular dynamics versus our hybrid OpenMP/MPI version.

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## Discontinuous Galerkin methods for general relativistic hydrodynamics

Jeudi juin 23, 2011
Speaker(s):

I will present the formalism needed for the application of discontinuous Galerkin methods to general relativistic hydrodynamics and the results obtained in the spherically symmetric case.

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## Liouville theory and Holographic Cosmology

Jeudi juin 23, 2011
Speaker(s):

I will explain how Liouville theory with complex values of its parameters arises naturally in speculative holographic cosmologies. We will encounter Liouville theory of both the spacelike'' and timelike'' variety. I will then use this as motivation to present some new results on the analytic continuation of Liouville theory recently obtained with Maltz and Witten.

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## Next Public Lecture

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