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.
We discuss how polarized emission can place constraints on the properties of accretion flows and jets in the strong gravity regime for systems like SgrA* and M87 being observed by the Event Horizon Telescope.
Black holes are the engines that power quasars and active galactic nuclei throughout cosmic time. The masses of black holes in nearby galaxies define clear correlations with the properties of their host galaxies. These results suggest that black holes, while a thousand times lighter than the galaxy, grow alongside their hosts during its cosmic evolution. I will discuss the growth of black holes, and the establishment of the connection between galaxies and black holes.
The Event Horizon Telescope is a project to assemble a global Very Long Baseline Interferometric (VLBI) array that operates at mm and submm wavelengths. With stations ranging from Hawaii to the South Pole, the array will have the angular resolution to image the nearest super massive black holes, and the sensitivity to time resolve dynamics at the event horizon. The central goal is to spatially resolve a region of space time where gravity is dominant, and to detect strong field GR signatures.
Prepare to be amazed. Nima Arkani-Hamed is one of the world's most innovative scientists, with an infectious enthusiasm for decoding the mysteries of the universe. Renowned for his dynamic and accessible speaking style, Arkani-Hamed is among the most sought-after experts on topics including dark matter, extra dimensions, particle colliders, and the interconnectedness of them all. He was featured prominently in the critically acclaimed 2013 documentary Particle Fever, chronicling the search at the LHC for the Higgs boson.
I present a proposal for a worldline action for discretized gravity with the same field content as loop quantum gravity. The proposal is defined through its action, which is a one-dimensional integral over the edges of the discretization. Every edge carries a finite-dimensional phase space, and the evolution equations are generated by a Hamiltonian, which is a sum over the constraints of the theory. I will explain the relevance of the model, and close with possible relations to other approaches of quantum gravity, including: relative locality, causal sets and twistor theory.