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SUMMARY: The anomalous transport of tracers in active baths - Omer Granek\
 , Technion - Israel Institute of Technology
DTSTART:20230214T130000Z
DTEND:20230214T140000Z
UID:TALK193462@talks.cam.ac.uk
CONTACT:Camille Scalliet
DESCRIPTION:We derive the long-time dynamics of a tracer immersed in a one
 -dimensional active bath. In contrast to previous studies\, we find that t
 he damping and noise correlations possess long-time tails with exponents t
 hat depend on the tracer symmetry. For generic tracers\, shape asymmetry i
 nduces ratchet effects that alter fluctuations and lead to superdiffusion 
 and friction that grows with time when the tracer is dragged at a constant
  speed. In the singular limit of a completely symmetric tracer\, we recove
 r normal diffusion and finite friction. Furthermore\, for small symmetric 
 tracers\, the active contribution to the friction becomes negative: active
  particles enhance motion rather than oppose it. These results show that\,
  in low-dimensional systems\, the motion of a passive tracer in an active 
 bath cannot be modelled as a persistent random walker with a finite correl
 ation time.\n\nZoom: https://maths-cam-ac-uk.zoom.us/j/98016675669
LOCATION:Center for Mathematical Sciences\, Lecture room MR4
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