QLS Seminar - TODAY Wed. 19 March at 14h00 - "Active from active" by Christian Maes, KU Leuven

[Quantitative Life Sciences]

Dear All,

Today,  Wednesday, 19 March at 14:00 CET, Prof. Christian Maes 
(Department of Physics and Astronomy, KU Leuven) will give a seminar titled:

*"Active from active"

*_Abstract:

_Can activity be transmitted from smaller to larger scales? We show such 
a transfer from a homogeneous active medium to a Newtonian spherical 
probe. The active medium consists of faster and dilute self-propelled 
particles, modeled as run-and-tumble particles in 1D or as active 
Brownian particles in 2D. We derive the reduced fluctuating dynamics of 
the probe valid for arbitrary probe velocity, characterized by a 
nonlinear friction and a velocity-dependent noise. There appear several 
distinct regimes: a standard regime where the probe exhibits passive 
Brownian motion, and peculiar active regimes where the probe becomes 
self-propelled with high persistence, and its velocity distribution 
begets peaks at non-zero values.
Those peaks and their persistence are quantitatively obtained and are 
perfectly confirmed by numerical simulations.
  In 1D, a soft coupling is necessary, whereas in 2D, more realistic 
interactions, such as Lennard-Jones, suffice.
Our study thus reveals how active motion can be transmitted between 
different scales solely via the induced friction and noise.

_Indico:_ https://indico.ictp.it/event/10994/*_
_*

The seminar will take place in the _Common area, Old SISSA building, 
second floor - Via Beirut, 2_*_
_
* You are all most welcome to attend!

Best regards,
Erica

Erica Sarnataro
Group Secretary
Quantitative Life Sciences
The Abdus Salam International Centre for Theoretical Physics (ICTP)
Trieste,  Italy
Tel. +39-040-2240623
www.ictp.it/research/qls.aspx
e-mail:qls at ictp.it