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TZID:Europe/Paris
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BEGIN:VEVENT
UID:0-754@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20201027T110000
DTEND;TZID=Europe/Paris:20201027T120000
DTSTAMP:20201022T120509Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-nicolas-levernier/
SUMMARY:Séminaire du LPTMS : Nicolas Levernier (IUSTI) - Grand amphi\, bâ
 timent Pascal n° 530 - 27 Oct 20 11:00
DESCRIPTION:Nicolas Levernier (IUSTI Aix-Marseille Université)\nFirst-pass
 age time of non markovian random walks\n\nSeminar in presence @LPTMS with 
 ZOOM streaming -- \nZOOM Meeting ID: 973 9548 5969 -- Password: 396890 --\
 n\nIn this talk\, I will present part of the results I got during my PhD\,
  and part of those obtained during my first postdoc\n\nI) The computation 
 of the encounter time of particles is a key question in many contexts\, as
  this time quantifies the reactivity rate for diffusion-limited processes.
  In the case of markovian random walks\, such as brownian motion\, some an
 alytic results can be obtained. But in the case of non-markovian processes
 \, much fewer results do exist\, although "non-markov is the rule and mark
 ov is the exception" (Van Kampen). In this talk I will present a formalism
  we have developed to deal with non-markovian gaussian random walks and sh
 ow its application to Fractional Brownian Motion\, a paradigmatic example 
 of highly-correlated process. If time allows\, I will briefly present how 
 aging of the dynamics can deeply modify the encounter time statistics.\n\n
 II) In the second part of my talk\, I will briefly present results I got d
 uring my first postdoc. I will show how chaotic motion can arise in an ext
 ended active gel layer\, typically describing cortical cytoskeleton\, wher
 e polymerization and contraction due to molecular motors are combined. Thi
 s result questions the usual description of the cortex as a thin layer\, a
 s such a description cannot describe this instability. I will also briefly
  present recent experimental evidences of this predicted phenomenon.\n
CATEGORIES:seminars
LOCATION:Grand amphi\, bâtiment Pascal n° 530\, rue André Rivière\, Ors
 ay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Rivière\, Orsay
 \, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Grand amphi\, bâtiment Pasca
 l n° 530:geo:0,0
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TZID:Europe/Paris
X-LIC-LOCATION:Europe/Paris
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DTSTART:20201025T020000
TZOFFSETFROM:+0200
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