Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phonon Spectrum in a Nanoparticle Mechanically Coupled to a Substrate   We calculate the vibrational density-of-states in an insulating nanoparticle
that is in weak mechanical contact with a semi-infinite substrate. The work is
motivated by a recent experiment by Yang et al., where the low-energy phonon
density-of-states of Y2O3 nanoparticles doped with Eu was measured. Preliminary
results presented here, based on the conventional quasiparticle-pole
approximation for the phonon propagator, are in reasonable agreement with
experiment.

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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: physics
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: patt-sol