Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase Diagram of a Lattice Microemulsion Model in Two Dimensions   The phase diagram of a lattice microemulsion model proposed by Ciach, H{\o}ye
and Stell is studied using mean-field theory and Monte Carlo simulations.
Surfactant directional degrees of freedom are summed out exactly before
mean-field theory is applied, and the resulting phase diagrams are much
improved compared with previous mean-field results. The critical line and
tricritical point is located using Monte Carlo simulations and finite size
scaling.

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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
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The categories of this paper are: cs
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con