Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classical Skyrmions -- Static Solutions and Dynamics   Skyrmions with a realistic value of the pion mass parameter are expected to
be quite compact structures, but beyond baryon number B=8 only a few examples
are known. The largest of these is the cubically symmetric B=32 Skyrmion which
is a truncated piece of the Skyrme crystal. Here it is proposed that many more
such Skyrmions could be found, without any restriction on the baryon number, as
pieces of the Skyrme crystal. Particular attention is given to the possibility
of reducing B by 1 by chopping a corner off a cubic crystal chunk.
  Nuclei are modelled by Skyrmions with quantised spin and isospin. Here it is
argued that these quantised states can be approximated by classically spinning
Skyrmions. The orientations of the spinning Skyrmions corresponding to
polarised protons, neutrons and deuterons are identified. Nuclear collisions
and the nuclear spin-orbit force are discussed in terms of classically spinning
Skyrmions. Going beyond the rigid collective motions of Skyrmions, there are
spatially modulated collective motions, which are oscillatory in time. They are
argued to describe not just vibrational excitations of nuclei, but also giant
resonance states.
  A speculative proposal for identifying quarks inside Skyrmions is briefly
discussed.

1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga