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SUMMARY:When Intuition About Brownian Motion Fails - Tanja Schilling (Albe
 rt-Ludwigs-Universität Freiburg)
DTSTART:20240213T130000Z
DTEND:20240213T140000Z
UID:TALK209743@talks.cam.ac.uk
CONTACT:Sarah Loos
DESCRIPTION:In physics\, we hardly ever describe a system in terms of all 
 of its microscopic degrees of freedom. We usually resort to effective coar
 se-grained models\, which predict the behaviour of "relevant" system prope
 rties. One widely used effective equation of motion for coarse-grained var
 iables is the Langevin equation\, a stochastic differential equation\, in 
 which the effect of the neglected degrees of freedom is encoded in frictio
 n terms and stochastic noise.\n\nI will review the steps of derivation and
  approximation that are required to obtain the Langevin equation from a sy
 stem's microscopic description. I will discuss the interplay between the p
 otential of mean force and the memory kernel\, the range of validity of th
 e second fluctuation dissipation theorem\, and the stochastic interpretati
 on of the fluctuating force\, i.e. the noise.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4
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