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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…
astro-ph1998
Atmospheric structure and acoustic cut-off frequency of roAp stars
N. Audard, F. Kupka, P. Morel +2
Some of the rapidly oscillating (CP2) stars, have frequencies which are larger than the theoretical acoustic cut-off frequency. As the cut-off frequency depends on the T(tau) relat…