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SUMMARY:Heterogeneities in granular media - Prof. Anita Mehta\, S N Bose N
 ational Centre for Basic Sciences\, Calcutta
DTSTART:20090611T131500Z
DTEND:20090611T141500Z
UID:TALK17627@talks.cam.ac.uk
CONTACT:Joe Bhaseen
DESCRIPTION:The absence of Brownian motion in granular media leads to the 
 presence of persistent heterogeneities. Bridges are examples of spatial he
 terogeneities\; I'll present numerical and analytical results on their str
 ucture and discuss their connection with force chains. Spatiotemporal hete
 rogeneities occur when specific regions of a granular system move in corre
 lated ways\; the surprisingly diverse dynamics of a granular column are an
  illustration of this. Our conclusions suggest that different dynamical ph
 ases — ballistic\, logarithmic\, activated\, and glassy — exist as a f
 unction of depth. The  glassy phase shows clear evidence of its intrinsic 
 (‘‘crystalline’’) states\, which lie below a band of approximately
  degenerate and metastable ground states\; in the other three phases\, by 
 contrast\, the system jams randomly into one of its metastable states.\n\n
 A. Mehta\, G. C. Barker\, J. M. Luck\, Physics Today\, pp 40-45 (May 2009)
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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