Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Novel Low-Temperature Behavior in Classical Many-Particle Systems   We show that classical many-particle systems interacting with certain soft
pair interactions in two dimensions exhibit novel low-temperature behaviors.
Ground states span from disordered to crystalline. At some densities, a large
fraction of normal-mode frequencies vanish. Lattice ground-state configurations
have more vanishing frequencies than disordered ground states at the same
density and exhibit vanishing shear moduli. For the melting transition from a
crystal, the thermal expansion coefficient is negative. These unusual results
are attributed to the topography of the energy landscape.

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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
2
The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: atom-ph