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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20260823T235302Z
LAST-MODIFIED:20150508T150016Z
DTSTART:20150515T160000Z
DTEND:20150515T170000Z
UID:event1447@bu.edu
URL:http://physics.bu.edu/internal/events/show/1447
SUMMARY:Aggregation and fragmentation kinetics. Application to Planetary Ri
	ngs.
DESCRIPTION:Featuring Nikolay Brilliantov\, University of Leicester\, Leice
	ster\, UK\nHosted by: Paul Krapivsky\n\nPart of the Biophysics/Condensed Ma
	tter Seminar Series.\n\nAbstract:\nKinetics of ballistic aggregation and fr
	agmentation is studied for a set of microscopic aggregation and fragmentati
	on models. We describe evolution of a system of interacting particles using
	 the Enskog-Boltzmann equation for the mass-velocity distribution function.
	 We derive Smoluchowski-like equations for concentrations of particles of d
	ifferent mass and for their mean kinetic energy. We analyze these equations
	 analytically and numerically. For the case of lacking fragmentation we obs
	erve several evolution regimes\, if however\, fragmentation is present\, th
	e system evolves to a steady state. We reveal universality of the particle 
	size distribution for the steady state. Namely\, we show that if fragmentat
	ion occurs with a strong dominance of small pieces\, the resulting steady-s
	tate distribution does not depend on a microscopic fragmentation mechanism.
	 Application to the Saturn Rings demonstrates a good agreement between the 
	observation data and the theory.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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