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SUMMARY:Scaling Laws of Passive-Scalar Diffusion in the Interstellar Mediu
 m and... links to pseudo- differential equations and levy flights - Matthe
 w Colbrook\, CCA
DTSTART:20161123T160000Z
DTEND:20161123T170000Z
UID:TALK68743@talks.cam.ac.uk
CONTACT:Lisa Maria Kreusser
DESCRIPTION:This talk summarises a summer project I did at Caltech in the 
 astrophysics department\, but\ndon’t worry - the talk will assume no kno
 wledge of physics. I will discuss scaling laws for turbulent\ndiffusion in
  the interstellar medium (the space between star systems) and why (astro)p
 hysicists care\nabout such things. The main exploration is whether we can 
 model such diffusion processes in the\nFourier domain as a Levy flight (ra
 ndom walk in which the step-lengths have a heavy-tailed\nprobability distr
 ibution). Can we measure some sort of ‘diffusion’ in the Fourier domai
 n? I will test\nsuggestive theoretical scalings with state of the art nume
 rical simulations run on XSEDE (a big\nsupercomputer) and some analysis in
  the Fourier domain. The evidence suggests one can measure\nsuch a diffusi
 on and I will discuss the implications of this. The talk contains some Fou
 rier analysis\,\nnumerical analysis and a pinch of probability.
LOCATION:MR14\, Centre for Mathematical Sciences
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