Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Symmetries of Fermion Fluids at Low Dimensions   We point out that the quasiparticle spectrum of the Landau Fermi liquid
theory has an extra $Z_2$ symmetry, local in momentum space, which is not
generic to the Hamiltonian with interactions. Thus the Fermi liquid is in this
sense a (quantum) zero-temperature critical point.

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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: nlin