Universal features of jamming in a model of frictionless granular media
Condensed Matter lunchtime seminar
Universal features of jamming in a model of frictionless granular media
- Event time: 1:00pm
- Event date: 5th February 2001
- Speaker: David Head (University of Edinburgh)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Event details
Recent results of Corey O'Hern et al. [1] have highlighted the possibility
of universal behaviour in a wide range of jammed systems, including
supercooled liquids, granular media and foams. Motivated by this
observation, Alexei Tkachenko (Bell Labs), Tom Witten (Chicago) and
myself have investigated packings of frictionless rigid discs,
using an algorithm originally devised by Tkachenko and Witten [2]. By
measuring P(F), the distribution of pair-particle forces, we have
confirmed the qualitative trends in [1], namely the formation of a plateau
or peak at small forces in the jammed state, which progressively vanishes
under shear. We have also attempted to define a quantitative measure of
the degree of 'chain-ness' in the system, and discuss how this may
relate to jamming.
References
[1]
C. S. O'Hern, S. A. Langer, A. J. Liu and S. R. Nagel,
Phys. Rev. Lett. 86, 111 (2000).
[2] A. V. Tkachenko and T. A. Witten, Phys. Rev. E 62, 2510 (2000).
[2] A. V. Tkachenko and T. A. Witten, Phys. Rev. E 62, 2510 (2000).
About Condensed Matter lunchtime seminars
This is a weekly series of informal talks given primarily by members of the institute of condensed matter and complex systems, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..