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TZID:Europe/Paris
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UID:1-326@lptms.universite-paris-saclay.fr
DTSTART:20150310T110000Z
DTEND:20150310T120000Z
DTSTAMP:20150127T081639Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-cesare-nardini/
SUMMARY:Séminaire du LPTMS: Cesare Nardini - LPTMS\, salle 201\, 2ème ét
 age\, Bât 100\, Campus d'Orsay - 10 Mar 15 11:00
DESCRIPTION:Non-Equilibrium long-range interacting systems : kinetic theory
  and large deviations\nCesare Nardini\, Edinburgh University\nLong-range i
 nteracting systems include gravitational systems\, plasma in the low densi
 ty limit\, two-dimensional and geophysical fluid models. In many physical 
 contexts\, long-range interacting systems are found to be out of equilibri
 um because of external driving. Examples come from climate dynamics\, plas
 ma physics and\, recently\, experimental setups with cold atoms driven by 
 laser light. Geophysical flows\, for example\, are characterised by their 
 self-organisation into large-scale coherent structures such as jet-streams
 \, cyclones and anti-cyclones. The description of these structures\, of th
 eir evolution and of extreme events they undergo (such as the sudden switc
 h of the system between multiple attractors) are outstanding problems at t
 he interface between climate science and statistical mechanics. In order t
 o address the description of driven long-range interacting systems in a th
 eoretical way\, we concentrate in this talk on models as simple as possibl
 e that still retain the following two main characteristics: non-local (i.e
 . long-range) nature of the interactions and broken detailed balance (i.e.
  non-equilibrium dynamics). We present results both for particle systems a
 nd quasi two-dimensional flows\, and we show that their dynamics can be de
 scribed very accurately in the limit where there is a separation of time s
 cales between the evolution of the mean state and the evolution of the flu
 ctuations around it. The main theoretical tools developed are kinetic theo
 ry and large deviations techniques: the accuracy of the results obtained w
 ill be compared to direct numerical simulations. Ongoing work and perspect
 ives on a combination of kinetic theory and large deviations theory to des
 cribe multistability in a very performant way will also be described.
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
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  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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