Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-dimensional inverse energy transfer induced by vortex
  reconnections   In low-temperature superfluid helium, viscosity is zero, and vorticity takes
the form of discrete, vortex filaments of fixed circulation and atomic
thickness. We present numerical evidence of three-dimensional inverse energy
transfer from small length scales to large length scales in superfluid
turbulence generated by a flow of vortex rings. We argue that the effect arises
from the anisotropy of the flow, which favours vortex reconnections of vortex
loops of the same polarity, and that it has been indirectly observed in the
laboratory. The effect open questions about analogies with related processes in
ordinary turbulence.

15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
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The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ