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UID:0-848@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20221122T110000
DTEND;TZID=Europe/Paris:20221122T120000
DTSTAMP:20221115T135121Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-martin-evans-edinburgh-3/
SUMMARY:Séminaire du LPTMS : Martin Evans (Edinburgh University) - Salle d
 es séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 22 Nov 22 1
 1:00
DESCRIPTION:Interacting Persistent Random Walkers\nMartin Evans (University
  of Edinburgh)\n\nHybrid: onsite seminar + zoom.\nRegister in advance for 
 this meeting:\nhttps://cnrs.zoom.us/meeting/register/tJcldumrpjkqGdWYFLoHp
 0xVov_xj7sDwbHh \nAfter registering\, you will receive a confirmation emai
 l containing information about joining the meeting.\n\nIn this talk I will
  consider persistent random walkers\, also known as run and tumble particl
 es\, which are emerging as a fundamental microscopic model of active matte
 r. I will first review the properties of a single persistent walker and sh
 ow how it interpolates between ballistic and diffusive motion.\nThe dynami
 cal spectrum of a persistent random walker exhibits `exceptional points' i
 ndicating dynamical transitions - a familiar example of an exceptional poi
 nt is the critical damping of the simple harmonic oscillator.\nI will then
  consider the case of two persistent random walkers that interact through 
 an exclusion interaction. An exact expression for the stationary state of 
 two such walkers on a periodic lattice reveals how the particles jam and g
 enerate an effective attractive potential. The full spectrum of the two-pa
 rticle problem can also be computed and again exhibits exceptional points\
 , which correspond to dynamical transitions in the relaxation time. Finall
 y\, I will discuss a more general `recoil' interaction between the persist
 ent walkers and show\nhow tuning the persistence length can generate attra
 ctive or repulsive effective interactions.\n\n
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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