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VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260915T081640Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20130402T193000Z
DTEND:20130402T203000Z
UID:event982@bu.edu
URL:http://physics.bu.edu/internal/events/show/982
SUMMARY:Jamming
DESCRIPTION:Featuring Andrea Liu\, University of Pennsylvania\nHosted by: R
	ama Bansil\, Ophelia Tsui\nPoster: http://physics.bu.edu/posters/2013_Sprin
	g/04_Liu.pdf\n\nPart of the Physics Department Colloquia Series.\n\nAbstrac
	t:\nAll around us things seem to get jammed.  Before breakfast\, coffe
	e grounds and cereal jam as they refuse to flow into our filters and bowls.
	 On the way to work\, we are caught in traffic jams.  In factories\, p
	owders jam as they clog in the conduits that were designed to have them flo
	w smoothly from one side of the factory floor to the other.  Our recou
	rse in all these situations is to pound on our containers\, dashboards and 
	conduits until the jam miraculously disappears.  We are usually so irr
	itated by the jam that we do not notice that the properties of the jammed s
	tate\, in all of these situations\, have similar behaviors that are quite d
	ifferent from those of crystalline solids.\n \nI will argue that many 
	similarities seen in the jammed state can be understood in terms of a singu
	lar point--the jamming transition of frictionless soft spheres.  This 
	transition coincides with the threshold of mechanical stability\, lending t
	he marginally-jammed solid special properties\, including a vanishing ratio
	 of the shear to bulk modulus and a diverging length scale characterizing t
	he minimum size of a cluster that is mechanically rigid.  This divergi
	ng length gives rise to qualitatively new physics by interfering with the u
	sual plane-wave behavior of low-frequency sound modes.  Even the lowes
	t frequency sound modes have wavelengths shorter than the divergent length 
	scale at the jamming transition.  As a result\, the disorder can never
	 be averaged away and a new class of modes appears\, swamping out plane wav
	e behavior all the way down to zero frequency.  In this sense\, the ma
	rginally-jammed solid can be considered the epitome of disorder--the opposi
	te limit from the perfect crystal.  \n 
LOCATION:SCI 109\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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