Jean-Philippe Bouchaud is a senior researcher at CEA-Saclay and Science & Finance/CFM. His fields of expertise are glassy dynamics, granular media and models of financial markets. A common theme between these three subjects is collective phenomena; the study of animal colonies and collective motion is a natural extension of his work, with potential cross fertilization and feedback between the different subjects. A crucial issue in the modelisation of financial markets is the relevance of collective phenomenon that can drive prices very far from their "equilibrium" (or fundamental) value. He has recently started student projects on penguin huddles, the dynamics of applause and the breakthrough of new products (such as cell phones).
J. P. Bouchaud, Y. Gefen, M. Potters, M. Wyart Fluctuations and Response in Financial markets: The subtle random nature of prices changes Quantitative Finance, to appear (April 2004).
I. Giardina and J. P. Bouchaud Bubbles, crashes and intermittency in agent based market models Eur. Phys.
J. B 31, 421 (2003) .
J. P. Bouchaud Power laws in economics and finance: some ideas from physics Proceedings of the Santa Fe conference "Beyond Efficiency", Quantitative Finance 1, 105 (2001).
Hugues Chate, co-ordinator of the Saclay node, is a senior researcher at CEA-Saclay. His fields of expertise are nonlinear dynamics, synchronisation and collective behaviour in chaotic systems, and non-equilibrium statistical mechanics at large. Recently, he has engaged in a study of the minimal conditions for collective motions of organisms, from molecular motors to bacteria, from cells to animals. This work has been the PhD research of Guillaume Gregoire, who was hired shortly after on a permanent position in University Paris 7.
G. Gregoire and H. Chate Onset of Collective and Cohesive Motion Phys. Rev. Lett. 92, 025702 (2004).
G. Gregoire and H. Chate Moving and staying together without a leader Physica D 181, 157 (2003).
G. Gregoire, H. Chate and Yuhai Tu Active and passive particles: Modeling beads in a bacterial bath Phys.Rev. E 64, 011902 (2001).
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