BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Active Caustics - Sriram Ramaswamy\, Indian Institute of Science
DTSTART:20231010T120000Z
DTEND:20231010T130000Z
UID:TALK206782@talks.cam.ac.uk
CONTACT:Marco Vona
DESCRIPTION:We show that self-propelled particles (SPPs) with no mechanica
 l inertia form caustics when advected by vortical flow. This seemingly ine
 rtial behaviour is a result of the persistence of their motion in the dire
 ction of their intrinsic orientation. We establish that SPPs form caustics
  at a critical distance from the origin of a single point vortex\, and in 
 straining regions when advected by 2D Navier-Stokes turbulence. This mecha
 nism for singularly high local concentrations in a macroscopically dilute 
 suspension of zero-Re swimmers has potential implications for communicatio
 n and sexual reproduction. This work was done in collaboration with Rahul 
 Chajwa\, Rajarshi\, and Rama Govindarajan\; see arXiv:2310.01829. 
LOCATION:MR12\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
END:VEVENT
END:VCALENDAR