The transformer that provides electricity to the AMS building in Providence went down on Sunday, April 22. The restoration of our email, website, AMS Bookstore and other systems is almost complete. We are currently running on a generator but overnight a new transformer should be hooked up and (fingers crossed) we should be fine by 8:00 (EDT) Wednesday morning. This issue has affected selected phones, which should be repaired by the end of today. No email was lost, although the accumulated messages are only just now being delivered so you should expect some delay.
Thanks for your patience.
"Physics in the Noise," by Michael F. Shlesinger. Nature, 7 June 2001.
Shlesinger traces the development of work in random walks, from Einstein's andJean Perrin's observations on motion to Lord Rayleigh's connection betweendiffusive heat flow and random scattering, to Scher's and Montroll'sexperiments with charged pairs of electrons and holes. Of note are newdevelopments based on the work of Paul Levy in the 1920s. "These non-gaussian'Levy flights' do not possess the smooth flow of a diffusion process. Becauseof the likelihood of longer and longer jumps, the flight paths burst out fromtheir origin, hitting a fractal clustered set of points. But how could suchmathematical conjuring ever find a physical application? Levy's work stayed inthe mathematical literature, unknown in physics until recently ... It was a bigsurprise that random Levy walks appeared in dynamical systems that aredeterministic without a hint of probability in the equations of motion. The keyis that seemingly random-like behaviour can arise through nonlinearity."
--- Annette Emerson