BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:The remarkable stability properties of AGN jets - Prof. Serguei Ko
 missarov (Univ. of Leeds)
DTSTART:20180514T130000Z
DTEND:20180514T140000Z
UID:TALK105145@talks.cam.ac.uk
CONTACT:Dr William Béthune
DESCRIPTION:On the one hand\, the jets of Active Galactic Nuclei appear to
  be remarkably stable - if jets produced by aircraft engines were that sta
 ble they would be able to reach to the Moon.  On the other hand\, many of 
 them eventually get disrupted\, most likely due to some kind of instabilit
 ies.  The reasons behind this behaviour remain unclear.  In my talk I will
  describe one possible explanation\, based on the causality principle and 
 the fact that the jet surrounding is highly inhomogeneous. I will also pre
 sent the results of our recent 3D simulations of relativistic hydro-jets s
 upporting the idea. In the simulations\, the key role is played by the cen
 trifugal instability  associated with the curved streamlines of the simula
 ted jets and not by the Kelvin-Helmholtz instability normally analysed in 
 stability studies of AGN jets.   Motivated by this discovery\, we explored
  the onset and evolution of the Relativistic Centrifugal Instability (RCFI
 ) in the simpler case of axisymmetric rotating flows as well. Following th
 e original physical argument of Lord Rayleigh\, we derived the relativisti
 c version of the Rayleigh criterion for this problem and used axially symm
 etric computer simulations to verify its predictions.
LOCATION:MR15\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
END:VEVENT
END:VCALENDAR