Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron-Electron scattering and resistivity of ballistic multimode
  channels   We show that electron--electron scattering gives a positive contribution to
the resistivity of ballistic multimode wires whose width is much smaller than
their length. This contribution is not exponentially small at low temperatures
and therefore may be experimentally observable. It scales with temperature as
$T^2$ for three-dimensional channels and as $T^{5/2}$ for two-dimensional ones.

7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
3
The categories of this paper are: physics