Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The nematic phase of a system of long hard rods - ICMP12 talk, Aalborg,
  August 2012   In this talk I consider a two-dimensional lattice model for liquid crystals
consisting of long rods interacting via purely hard core interactions, with two
allowed orientations defined by the underlying lattice. I report a rigorous
proof of the existence of a nematic phase: by this I mean that at intermediate
densities the system exhibits orientational order, either horizontal or
vertical, but no positional order. The proof is based on a two-scales cluster
expansion: first the system is coarse-grained on a scale comparable with the
rods' length; then the resulting effective theory is re-expressed as a
contours' model, which can be treated by Pirogov-Sinai methods. The talk is
based on joint work with Margherita Disertori.

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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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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: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: eess