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12 papers · 1 filter
Twist and writhe dynamics of stiff filaments
A. C. Maggs
This letter considers the dynamics of a stiff filament, in particular the coupling of twist and bend via writhe. The time dependence of the writhe of a filament is $W_r^2\sim L t^{…
Long-range Casimir interactions between impurities in nematic liquid crystals and the collapse of polymer chains in such solvents
D. Bartolo, D. Long, J. -B. Fournier
The elastic interactions between objects embedded in a nematic liquid crystal are usually caused by the average distorsion-rather than by the fluctuations-of the nematic orientatio…
Dynamical phases and hysteresis in a simple one-lane traffic model
M. Antoni, R. Cafiero
A two parameter model for single lane car-following is introduced and its equilibrium and non-equilibrium properties are studied. Despite its simplicity, this model exhibits a rich…
A simple system with two temperatures
Raphael Exartier, Luca Peliti
We study the stationary nonequilibrium regime which settles in when two single-spin paramagnets each in contact with its own thermal bath are coupled. The response vs. correlation…
Criticality of the "critical state" of granular media: Dilatancy angle in the tetris model
M. Piccioni, V. Loreto, S. Roux
The dilatancy angle describes the propensity of a granular medium to dilate under an applied shear. Using a simple spin model (the ``tetris'' model) which accounts for geometrical…
Entropy for relaxation dynamics in granular media
E. Caglioti, V. Loreto
We investigate the role of entropic concepts for the relaxation dynamics in granular systems. In these systems the existence of a geometrical frustration induces a drastic modifica…