2 papers
cond-mat.other2007
Singularity displacement in random speckle patterns of diffusive and localized waves: universality lost and regained
Sheng Zhang, Bing Hu, Patrick Sebbah +1
All random wave fields possess a network of phase singularities. We show that while the phase statistics within speckle patterns is generic, the statistics of the motion of phase s…
cond-mat1998
Crashes as Critical Points
Anders Johansen, Olivier Ledoit, Didier Sornette
We study a rational expectation model of bubbles and crashes. The model has two components : (1) our key assumption is that a crash may be caused by local self-reinforcing imitatio…