Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transport properties of spacetime-filling branes   A model consisting of (d+1)-dimensional gravity coupled to spacetime filling
charged branes is used to study the effects of backreaction. The charged black
holes arising from this simple model reflect the non-linearity of the gauge
field and are thermodynamically stable. By analysing fluctuations of the system
we corroborate that at low values of the temperature (or large chemical
potential) backreaction effects from the branes are dominant. We also provide a
generalisation of the Iqbal and Liu strategy to calculate the DC conductivity,
in which a mass term for the gauge field fluctuation is included. This mass
term gives the value of the residue of the pole at zero frequency in the
imaginary part of the AC conductivity, as well as the running of the DC
conductivity with the bulk radius.

30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci