Since 2002 Perimeter Institute has been recording seminars, conference talks, public outreach events such as talks from top scientists 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 and 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.
Accessibly by anyone with internet, Perimeter aims to share the power and wonder of science with this free library.
In this talk we study a special class of high-energy states in holographic CFTs defined via Euclidean evolution from conformal boundary states. We argue that these are dual to black hole microstates with a geometrical behind-the-horizon region. We study the time-dependent physics of this behind-the-horizon region, whose ETW boundary geometry takes the form of a closed FRW spacetime. We show that in many cases, this behind-the-horizon physics can be probed directly by looking at the time dependence of entanglement entropy for sufficiently large spatial CFT subsystems.
In the framework of ontological models, the features of quantum
theory that emerge as inherently nonclassical always involve properties that
are fine tuned, i.e. properties that hold at the operational level but break at the
ontological level (they only hold for fine tuned values of the ontic parameters). Famous
Magnetic skyrmions are topological solitons which occur in a large class of ferromagnetic materials and which are currently attracting much attention, not least because of their potential use for low-energy magnetic information storage and manipulation. The talk is about an integrable model for magnetic skyrmions, introduced in a recent paper (arxiv:1812.07268) and generalised in arxiv:1905.06285.