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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20260813T211223Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20070202T170000Z
DTEND:20070202T190000Z
UID:event73@bu.edu
URL:http://physics.bu.edu/internal/events/show/73
SUMMARY:Are Mechanically Stable Hard Particle Packings Equally Likely?
DESCRIPTION:Featuring Corey S. O'Hern\, Yale University\n\nPart of the Biop
	hysics/Condensed Matter Seminar Series.\n\nThere have been several attempts
	 to construct statistical mechanical descriptions of athermal particulate s
	ystems\, for example the Edward's entropy description for granular material
	s.  Tapping experiments by Nowak\, et al. (Phys. Rev. E\, 57 (1998) 1971) a
	nd numerical simulations of granular shear flow by Makse\, et al. (Nature 4
	15 (2002) 614) have shown that the Edward's description may be promising fo
	r slow\, dense granular flows.  An essential assumption of the Edward's fra
	mework is that all jammed configurations are equally likely.  However\, thi
	s assumption has not been explicitly tested.  Using numerical simulations\,
	 we create jammed hard particle packings using two experimentally relevant 
	protocols: 1) a compression and decompression scheme and 2) quasi-static sh
	ear flow at constant pressure.  For both methods\, we find that jammed pack
	ings are not equally likely\, and thus we argue that the Edward's entropy d
	escription for granular materials should be reconsidered.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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