We present in this paper a numerical study of the vibrational eigenvectors of
a two-dimensional amorphous material, previously deeply studied from the point
of view of mechanical properties and vibrational eigen-frequencies [7-10].
Attention is paid here to the connection between the mechanical properties of
this material in term of elastic heterogeneities (EH), and how these inherent
heterogeneous structures affect the vibrational eigenvectors and their plane
waves decomposition. The systems are analysed for different hydrostatic
pressures, and using results from previous studies, a deeper understanding of
the boson peak scenario is obtained. The vibrational spectrum of a continuously
densified silica glass is also studied, from which it appears that the
pulsation associated with the boson peak follows the same pressure dependence
trend than that of transverse waves with pulsation associated with the EH
characteristic size.Comment: 9 pages, 12 figure
