Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High Temperature Partition Function of the Rigid String   We find that the high temperature limit of the free energy per unit length
for the rigid string agrees dimensionally with that of the QCD string (unlike
the Nambu-Goto string). The sign, and in fact the phase, do not agree. While
this may be a clue to a string theory of QCD, we note that the problem of the
fourth derivative action makes it impossible for the rigid string to be a
correct description.

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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
3
The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc