Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Emergence of isotropy and dynamic self-similarity in the birth of
  two-dimensional wave turbulence   Turbulence, characterised by cascades of excitations across lengthscales, is
ubiquitous in nature. Many of its statistical steady-state properties are
universal, but little is established experimentally about how they emerge,
starting from an equilibrium system. Here, we initiate a wave cascade in a
two-dimensional Bose gas, using a large-scale oscillating force, and probe it
on all lengthscales from the forcing one to the small one where energy is
eventually dissipated. We observe two key phenomena conceptually associated
with the development of turbulence -- the emergence of statistical isotropy
under anisotropic forcing, and the spatiotemporal scaling of the spectrum of
excitations at times before any energy is dissipated. This new microscopic view
on turbulence could enable further studies relevant for fields ranging from
mesoscopic physics to cosmology.

14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph