Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modified London Equation, Abrikosov-Like Vortices and Knot Solitons in
  Two-Gap Superconductors   We derive the exact modified London equation for the two-gap superconductor,
compare it with its single-gap counterpart. We show that the vortices in the
two-gap superconductor are soft (or continuous) core vortices. In particular,
we discuss the topological structure of the finite energy vortices
(Abrikosov-like vortices), and find that they can be viewed as the incarnation
of the baby skyrmion stretched in the third direction. Besides, we point out
that the knot soliton in the two-gap superconductor is the twisted
Abrikosov-like vortex with its two periodic ends connected smoothly. The
relation between the magnetic monopoles and the Abrikosov-like vortices is also
discussed briefly.

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The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph