Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of Phase Shift in Shape Changing Collision of Solitons in Coupled
  Nonlinear Schroedinger Equations   Soliton interactions in systems modelled by coupled nonlinear Schroedinger
(CNLS) equations and encountered in phenomena such as wave propagation in
optical fibers and photorefractive media possess unusual features : shape
changing intensity redistributions, amplitude dependent phase shifts and
relative separation distances. We demonstrate these properties in the case of
integrable 2-CNLS equations. As a simple example, we consider the stationary
two-soliton solution which is equivalent to the so-called partially coherent
soliton (PCS) solution discussed much in the recent literature.

16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas