Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Persistence of hydrodynamic envelope solitons: detection and rogue wave
  occurrence   The observation of a wave group persisting for more than 200 periods in the
direct numerical simulation of nonlinear unidirectional irregular water waves
in deep water is discussed. The simulation conditions are characterized by
parameters realistic for broad-banded waves in the sea. The group is identified
by the solution of the associated scattering problem for the nonlinear
Schr\"odinger equation as the intense envelope soliton with remarkably stable
parameters. Most of extreme waves occur on top of this group, resulting in
higher and longer rogue wave events.

32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th