Configurational entropy of hard spheres

We numerically calculate the configurational entropy S-conf of a binary mixture of hard spheres, by using a perturbed Hamiltonian method trapping the system inside a given state, which requires fewer assumptions than the previous methods (Speedy 1998 Mol. Phys. 95 169). We find that Sconf is a decreasing function of the packing fraction. and extrapolates to zero at the Kauzmann packing fraction phi K similar or equal to 0.62, suggesting the possibility of an ideal glass transition for the hard-sphere system. Finally, the Adam-Gibbs relation is found to hold.