Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical stabilization of the bcc phase in lanthanum and thorium by
  phonon-phonon interaction   The recently developed self consistent {\it ab initio} lattice dynamical
method (SCAILD) has been applied to the high temperature bcc phase of La and Th
which are dynamically unstable at low temperatures. The bcc phase of these
metals is found to be stabilized by phonon-phonon interactions. The calculated
high temperature phonon frequencies for La are found to be in good agreement
with the corresponding experimental data.

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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: cs