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SUMMARY:Microbial billiards
DTSTART;VALUE=DATE-TIME:20250612T093000Z
DTEND;VALUE=DATE-TIME:20250612T100000Z
DTSTAMP;VALUE=DATE-TIME:20260510T141434Z
UID:indico-contribution-1543@cern.ch
DESCRIPTION:Speakers: Roberto  Di Leonardo (DIPARTIMENTO DI FISICA SAPIENZ
 A  Università di Roma)\nUnlike gas molecules at equilibrium\, the spatial
  organization of self-propelled particles can be very sensitive to what ha
 ppens at the boundaries of their container. Understanding the link between
  boundary phenomena and bulk stationary distributions could enable the des
 ign of optimized con- tainer shapes for the geometric control of confined 
 active particles. Here we propose a boundary method based on the flux tran
 sfer formalism typical of radiometry problems\, where surface ele- ments t
 ransmit and receive “rays” of active particles with infinite persisten
 ce length. We demon- strate the power of this boundary method in the case 
 of the swimming microalgae Euglena gracilis trapped in light-defined billi
 ard geometries. Leveraging our boundary method\, we were able to design a 
 stacked multi-stage billiard geometry\, with a connection scheme between s
 ubunits that breaks spatial symmetry and achieves an exponential amplifica
 tion of cell concentration between its two ends. Surprisingly\, the sensit
 ive dependence on boundary geometry observed in closed microbial billiards
  stands in marked contrast to the robust invariance of mean path lengths t
 raced by E.coli bacteria swimming in microfabricated open billiards with f
 rozen internal disorder.\n\nhttps://indico.unina.it/event/91/contributions
 /1543/
LOCATION:Hotel Palazzo Alabardieri Sala Caracciolo
URL:https://indico.unina.it/event/91/contributions/1543/
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