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We study the pressure dependence of vibrational spectrum of amorphous silicon using an ab initio constant pressure relaxation simulation. With the application of pressure the low-energy modes soften and their acousticlike character decreases. On the other hand, high-frequency modes shift toward the higher energies, and the localized spectral tail modes become extended under pressure.doi:10.1103/physrevb.66.155205 fatcat:4e5rocty6fc2lpuu643ixwnx4e