Displacement convexity of Boltzmann’s entropy characterizes positive energy in general relativity
Speaker: Robert McCann (University of Toronto) Title: Displacement convexity of Boltzmann's entropy characterizes positive energy in general relativity Abstract: Einstein's theory of gravity is based on assuming that the fluxes of a energy and momentum in a physical system are proportional to a certain variant of the Ricci curvature tensor on a smooth 3+1 dimensional spacetime. The fact that […]
Innovation in Cell Phones in the US and China: Who Improves Technology Faster?
Speaker: Richard B. Freeman (Harvard University and NBER) Title: Innovation in Cell Phones in the US and China: Who Improves Technology Faster? Abstract: Cell phones are the archetypical modern consumer innovation, spreading around the world at an incredible pace, extensively used for connecting people with the Internet and diverse apps. Consumers report spending from 2-5 hours a day […]