Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Folding Transition of the Triangular Lattice   We study the problem of folding of the regular triangular lattice in the
presence of bending rigidity K and magnetic field h (conjugate to the local
normal vectors to the triangles). A numerical study of the transfer matrix of
the problem shows the existence of three first order transition lines in the
(K,h) plane separating three phases: a folded phase, a phase frozen in the
completely flat configuration (with all normal vectors pointing up) and its
mirror image (all normal vectors pointing down). At zero magnetic field, a
first order folding transition is found at a positive value K_c=0.11(1) of the
bending rigidity, corresponding to a triple point in the phase diagram.

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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cs