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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-511@lptms.universite-paris-saclay.fr
DTSTART:20170523T110000Z
DTEND:20170523T120000Z
DTSTAMP:20170414T130937Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-ken-sekimoto/
SUMMARY:Séminaire du LPTMS: Ken Sekimoto - LPTMS\, salle 201\, 2ème étag
 e\, Bât 100\, Campus d'Orsay - 23 Mai 17 11:00
DESCRIPTION:Coarse-Graining of Momentum Flow\nKen Sekimoto (MSC\, Universit
 é Denis Diderot &amp\; Gulliver\, ESPCI)\nLike the energy and mass\, the 
 momentum is also a conserved quantity.  Usually\, however\, we pay less a
 ttention to the role played by the last  one as compared with the former 
 ones. In the present talk\, I will  discuss the three examples in which t
 he concept of momentum flow helps  and simplifies our understanding of ph
 enomena.\n\nFirst we discuss the ``adiabatic-piston'' for which the physic
 al origin  of the non-equilibrium force has long been unclear. The consid
 eration of  the momentum flux of both the gases and piston allows to reac
 h the  central results in a few lines of elementary calculation\, elucida
 ting  how the non-equilibrium force emerges.\n\nSecondly we present a met
 hod of coarse-graining the overdamped dynamics  of dense cellular packing
  of matters.'' We show that the coarse graining  of the momentum and angu
 lar momentum fluxes leads naturally to the  Irving-Kirkwood type formula 
 for the stress tensor irressective of the underlying dynamics.\n\nLastly w
 e discuss the Newton's cradle with modified repulsive laws. This  classic
 al 1D system can show the similarity to the quantum Mössbauer  absorptio
 n and emission. By considering the momentum flow through the  cluster\, w
 e reach the coarse-grained dynamics for the center of mass coupled with an
  ``evanescent'' wave.
CATEGORIES:seminars
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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