Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Sound of M-Theory   We consider sound propagation on M5- and M2-branes in the hydrodynamic limit.
In particular, we look at the low energy description of a stack of N M-branes
at finite temperature. At low energy, the M-branes are well described, via the
AdS/CFT correspondence, in terms of classical solutions to the eleven
dimensional supergravity equations of motion. From this gravitational
description, we calculate Lorentzian signature two-point functions of the
stress-energy tensor on these M-branes in the long-distance, low-frequency
limit, i.e. the hydrodynamic limit. The poles in these Green's functions show
evidence for sound propagation in the field theory living on the M-branes.

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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: cs
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph