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.
I will wander through the issues of fundamental quantum amplifier noise pointing out the very fundamental relation between that noise and the commutation relations of quantum mechanics. I will also present a simple model of a completely linear phase insensitive amplifier. I will then show the relation between such linear amplifiers and black holes, the irrelevance of energy to the notion of an amplifier, and look at Hawking Radiation as such amplifier noise. Finally, I will discuss dumb holes, and the contention that our UBC experiment measured Hawking radiation.
Dr. Smolin is a faculty member at Perimeter Institute for Theoretical Physics and author of several books including most recently
The generalized unitarity method reconstructs loop-level scattering amplitudes from tree-level scattering amplitudes. We review some of the steps of this method which are necessary for applications in any quantum field theory, discuss several points of view and emphasize some of the aspects that can be easily automated.
We mainly use N=4 super-Yang-Mills theory to illustrate the discussion and comment on the necessary changes for applications to super-Yang-Mills theories with reduced supersymmetry.
Sarah Croke - is a postdoctoral researcher at Perimeter Institute. From Ireland and the UK originally, she received a BSc in Physics and Applied Mathematics from University College Cork, Ireland in 2003. After a brief stint as a radio astronomer, completing an MSc in Astrophysics, she studied Quantum Information and Quantum Optics under the supervision of Prof Stephen Barnett at the University of Strathclyde, UK, receiving a PhD in 2007. She has been a postdoc at PI since November 2007.
A number of recent proposals for a quantum theory of gravity are based on the idea that spacetime geometry and gravity are derivative concepts and only apply at an approximate level. Two fundamental challenges to any such approach are, at the conceptual level, the role of time in the emergent context and, technically, the fact that the lack of a fundamental spacetime makes difficult the straightforward application of well-known methods of statistical physics and quantum field theory to the problem.