PACS. 61.43Fs -Glasses. PACS. 61.20Lc -Structure of liquids: Time-dependent properties; relaxation. PACS. 02.70Ns -Molecular dynamics and particle methods.Abstract. -By using extensive molecular dynamics simulations, we have determined the violation of the fluctuation-dissipation theorem in a Lennard-Jones liquid quenched to low temperatures. For this we have calculated X(C), the ratio between a one-particle time-correlation function C and the associated response function. Our results are best fitted by assuming that X(C) is a discontinuous, piecewise constant function. This is similar to what is found in spin systems with one-step replica symmetry breaking. This strengthens the conjecture of a similarity between the phase space structure of structural glasses and such spin systems.c EDP Sciences
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