Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The collision of two-kinks defects   We have investigated the head-on collision of a two-kink and a two-antikink
pair that arises as a generalization of the $\phi^4$ model. We have evolved
numerically the Klein-Gordon equation with a new spectral algorithm whose
accuracy and convergence were attested by the numerical tests. As a general
result, the two-kink pair is annihilated radiating away most of the scalar
field. It is possible the production of oscillons-like configurations after the
collision that bounce and coalesce to form a small amplitude oscillon at the
origin. The new feature is the formation of a sequence of quasi-stationary
structures that we have identified as lump-like solutions of non-topological
nature. The amount of time these structures survives depends on the fine-tuning
of the impact velocity.

34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci