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UID:1-277@lptms.universite-paris-saclay.fr
DTSTART:20140910T100000Z
DTEND:20140910T130000Z
DTSTAMP:20140731T120007Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/soutenance-de-th
 ese-francois-landes/
SUMMARY:Soutenance de thèse : François Landes - IPN-batiment 100\, Audito
 riurm - 10 Sep 14 10:00
DESCRIPTION:Viscoelastic interfaces Driven in Disordered Media &amp\; Appli
 cation to Friction\nFrançois Landes\, LPTMS\nMany complex systems respond
  to a continuous input of energy by an accumulation of stress over time\, 
 interrupted by sudden energy releases called avalanches. Recently\, it has
  been pointed out that several basic features of avalanche dynamics are in
 duced at the microscopic level by relaxation processes\, which are neglect
 ed by most models. During my thesis\, I studied two well-known models of a
 valanche dynamics\, modified minimally by the inclusion of some forms of r
 elaxation.\nThe first system is that of a viscoelastic interface driven in
  a disordered medium. In mean-field\, we prove that the interface has a pe
 riodic behaviour (with a new\, emerging time scale)\, with avalanche event
 s that span the whole system. We compute semi-analytically the friction fo
 rce acting on this surface\, and find that it is compatible with classical
  friction experiments. In finite dimensions (2D)\, the mean-field system-s
 ized events become local\, and numerical simulations give qualitative and 
 quantitative results in good agreement with several important features of 
 real earthquakes.\nThe second system including a minimal form of relaxatio
 n consists in a toy model of avalanches: the Directed Percolation process.
  In our study of a non-Markovian variant of Directed Percolation\, we obse
 rved that the universality class was modified but not completely. In parti
 cular\, in the non-Markov case an exponent changes of value while several 
 scaling relations still hold. This picture of an extended universality cla
 ss obtained by the addition of a non-Markovian perturbation to the dynamic
 s provides promising prospects for our first system.
LOCATION:IPN-batiment 100\, Auditoriurm\, 15 Rue Georges Clemenceau\, orsay
 \, France
GEO:48.698196;2.181773
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  orsay\, France;X-APPLE-RADIUS=100;X-TITLE=IPN-batiment 100\, Auditoriurm:
 geo:48.698196,2.181773
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