Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heat conduction in 2d nonlinear lattices   The divergence of the heat conductivity in the thermodynamic limit is
investigated in 2d-lattice models of anharmonic solids with nearest-neighbour
interaction from single-well potentials. Two different numerical approaches
based on nonequilibrium and equilibrium simulations provide consistent
indications in favour of a logarithmic divergence in "ergodic", i.e. highly
chaotic, dynamical regimes. Analytical estimates obtained in the framework of
linear-response theory confirm this finding, while tracing back the physical
origin of this {\sl anomalous} transport to the slow diffusion of the energy of
long-wavelength effective Fourier modes. Finally, numerical evidence of {\sl
superanomalous} transport is given in the weakly chaotic regime, typically
found below some energy density threshold.

8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg