Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Synchronization Defects and Broken Symmetry in Spiral Waves   Spiral waves are investigated in oscillatory media exhibiting period-doubling
bifurcations. In the period-doubled and chaotic regimes, the rotational
symmetry of the spiral wave is broken. The loss of symmetry takes the form of
synchronization defect lines where the phase of the local oscillation changes
by multiples of 2\pi. The internal structure and geometry of these
synchronization defects is studied and a discussion of the possible types of
defect lines is presented.

33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics