A new real-space renormalization technique is introduced, aimed at simplifying the computation of dynamical properties of granular structures at wavelengths of order a typical grain size. The technique consists in replacing the large number of atoms within a grain by a small number of rigid masses and choosing the couplings between the masses to reproduce the low-lying properties of the isolated grains. The transformation is shown to yield results that converge rapidly to the exact solution for the dynamical properties at intermediate wavelengths.
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Shahtahmasebi, N., Lambert, C.J. Selective renormalization in real space: A simple approach to intermediate-wavelength properties of granular structures. J Low Temp Phys 71, 87–95 (1988). https://doi.org/10.1007/BF00115043
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DOI: https://doi.org/10.1007/BF00115043