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We study by means of molecular dynamics simulations the aging behavior of amolecular model of ortho-terphenyl. We find evidence of a a non-monotonicevolution of the volume during an isothermal-isobaric equilibration process, aphenomenon known in polymeric systems as Kovacs effect. We characterize thisphenomenology in terms of landscape properties, providing evidence that, farfrom equilibrium, the system explores region of the potential energy landscapedistinct from the one explored in thermal equilibrium. We discuss the relevanceof our findings for the present understanding of the thermodynamics of theglass state.Comment: RevTeX 4, 4 pages, 5 eps figure

Crossover (or Kovacs) Effect in an Aging Molecular Liquid