Athermal Jamming vs Thermalized Glassiness in Sheared Frictionless Particles

Numerical simulations of soft-core frictionless disks in two dimensions are carried out to study behavior of a simple liquid as a function of thermal temperature T , packing fraction φ, and uniform applied shear strain rate γ̇. Inferring the hard-core limit from our soft-core results, we find that it depends on the two parameters φ and T/γ̇. T/γ̇ → 0 defines the athermal limit in which a shear driven jamming transition occurs at a well defined φJ . T/γ̇ → ∞ defines the thermalized limit where an equilibrium glass transition may take place at a φG. This conclusion argues that athermal jamming and equilibrium glassy behavior are not controlled by the same critical point. Preliminary results suggest φG < φJ .