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BEGIN:VEVENT
DTSTAMP:20260628T024218Z
DTSTART;VALUE=DATE-TIME:20071106T151500
DTEND;VALUE=DATE-TIME:20071106T170000
SUMMARY:Nick Watkins (Natural Complexity Project\, British Antarctic Surv
 ey\, Cambridge UK)
TZID:Europe/London
UID:20071106-094d43d5385c299a01386c3bd890643c@warwick.ac.uk
CREATED:20070913T091437Z
DESCRIPTION:Title: Some aspects of Levy flights: Natural\, fractional ...
  and imaginary Abstract: In the 1960s Mandelbrot developed several fract
 al models to describe how the shape of many aspects of the natural world
  departs from the Euclidean. One modelled heavy tailed jumps-the "Noah e
 ffect"\, typical of economic index time series-using Levy flights. In th
 e introductory section I will show a few examples of natural systems for
  which Levy flights or walks offer a useful model\, including the Earth'
 s auroral electric currents and the turbulent solar wind which is their 
 ultimate energy source. I will also mention recent work where we have re
 visited an earlier study which had identified Levy walks in albatross fo
 raging\, using new data and improved analysis methods. In my more techni
 cal section I will describe studies using a simple self-affine stable mo
 del-linear fractional stable motion\, LFSM\, which unifies Levy flights 
 with long range memory-to give insight into space physics data. I will p
 resent a newly-derived diffusion equation for LFSM\, and show work in pr
 ogress using an LFSM generator and simple analytic scaling arguments to 
 study the problem of the area between an LFSM curve and a threshold. Fin
 ally I will discuss how LFSM gives the appearance of multi-affine scalin
 g without having an underlying turbulent cascade or other multiplicative
  process. The importance of this property for the interpretation of natu
 ral time series will be discussed.
LOCATION:Maths B1.01
CATEGORIES:forum
LAST-MODIFIED:20120709T145406Z
ORGANIZER;CN="":
END:VEVENT
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