Simulations on the vibrational density of states of very large percolation clusters are presented. Above threshold (p>pc), not only does one find no accumulation of modes around the phonon-fracton crossover, but the number of modes is also depressed throughout the fracton region. These ``missing modes'' accumulate near the upper frequency cutoff. The reason for this pileup is explained, and scaling considerations account for the dependence on p-pc of the size of this effect.
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Yakubo et al. (1990) studied this question.
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