Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Few-body collective excitations beyond Kohn's theorem in quantum Hall
  systems   A relative coordinate breathing mode in the quantum Hall system is predicted
to exist with different behavior under either Coulomb or dipole-dipole
interactions. While Kohn's theorem predicts that any relative coordinate
interaction will fail to alter the center of mass energy spectrum, it can
affect excitations in the relative coordinates. One such collective excitation,
which we call the hyperradial breathing mode, emerges naturally from a
few-body, hyperspherical representation of the problem and depends on the
inter-particle interactions, the ground state wave function, and the number of
particles participating in the excitation. Possible observations of this
excitation will be discussed in the context of both cold rotating atomic
simulations and conventional quantum Hall experiments.

27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph