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.
Fractional branes and dynamical SUSY breaking
The causal set -- mathematically a finitary partial order -- is a candidate discrete substratum for spacetime. I will introduce this idea and describe some aspects of causal set kinematics, dynamics, and phenomenology, including, as time permits, a notion of fractal dimension, a (classical) dynamics of stochastic growth, and an idea for explaining some of the puzzling large numbers of cosmology. I will also mention some general insights that have emerged from the study of causal sets, the most recent one concerning the role of intermediate length-scales in discrete spacetime theories.
Statement by Roberto Unger;
Social science;
The crisis in all disciplines;
Time in mathematics and logic;
Website.
Internal/operational point of view vs. external point of view;
Microscopic ontology;
Notions and meaning of evolving laws.
Symmetry breaking and symmetry of physical laws;
Quantum mechanics and emergence;
Emergence, laws and unexplained features of nature;
Relational quantities.
Causality in biology;
Emergence of physical laws;
Holes in configuration space and ontology;
Self-reproducing entities.