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CATEGORIES:DAMTP Statistical Physics and Soft Matter Seminar
SUMMARY: The anomalous transport of tracers in active bath
s - Omer Granek\, Technion - Israel Institute of T
echnology
DTSTART;TZID=Europe/London:20230214T130000
DTEND;TZID=Europe/London:20230214T140000
UID:TALK193462AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/193462
DESCRIPTION:We derive the long-time dynamics of a tracer immer
sed in a one-dimensional active bath. In contrast
to previous studies\, we find that the damping and
noise correlations possess long-time tails with e
xponents that depend on the tracer symmetry. For g
eneric tracers\, shape asymmetry induces ratchet e
ffects that alter fluctuations and lead to superdi
ffusion and friction that grows with time when the
tracer is dragged at a constant speed. In the sin
gular limit of a completely symmetric tracer\, we
recover normal diffusion and finite friction. Furt
hermore\, for small symmetric tracers\, the active
contribution to the friction becomes negative: ac
tive particles enhance motion rather than oppose i
t. These results show that\, in low-dimensional sy
stems\, the motion of a passive tracer in an activ
e bath cannot be modelled as a persistent random w
alker with a finite correlation time.\n\nZoom: htt
ps://maths-cam-ac-uk.zoom.us/j/98016675669
LOCATION:Center for Mathematical Sciences\, Lecture room MR
4
CONTACT:Camille Scalliet
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