Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Negative Off-Diagonal Conductivities in a Weakly Coupled Quark Gluon
  Plasma   We calculate the conductivity matrix of a weakly coupled quark-gluon plasma
at the leading-log order. By setting all quark chemical potentials to be
identical, the diagonal conductivities become degenerate and positive, while
the off-diagonal ones become degenerate but negative (or zero when the chemical
potential vanishes). This means a potential gradient of a certain fermion
flavor can drive backward currents of other flavors. A simple explanation is
provided for this seemingly counter intuitive phenomenon. It is speculated that
this phenomenon is generic and most easily measured in cold atom experiments.

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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
1
The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: math