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We study the interaction of the relaxation processes with the densityfluctuations by molecular dynamics simulation of a flexible molecule model foro-terphenyl (oTP) in the liquid and supercooled phases. We find evidence,besides the structural relaxation, of a secondary vibrational relaxation whosecharacteristic time, few ps, is slightly temperature dependent. This i)confirms the result by Monaco et al. [Phys. Rev, E 62, 7595 (2000)] of thevibrational nature of the fast relaxation observed in Brillouin LightScattering (BLS) experiments in oTP; and ii) poses a caveat on theinterpretation of the BLS spectra of molecular systems in terms of a purelycenter of mass dynamics.Comment: RevTeX, 5 pages, 4 eps figure

Vibrational origin of the fast relaxation processes in molecular glass formers