Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Waves in a Bose-Einstein condensate of atoms with a dipole moment   Based on the modified Gross-Pitaevskii equation for atoms with intrinsic
dipole moments which accounts for the relaxation of a condensate, the
dipole-dipole interaction and the interaction of atoms with the electromagnetic
field, the propagation of the sound and electromagnetic waves in a
Bose-Einstein condensate is studied. Owing to hybridization of the
electromagnetic and sound waves near the resonance frequency of an atom, there
arise the two branches of excitations in which the electromagnetic oscillations
transform into the sound oscillations and vice versa. It is shown that under
hybridization the crucial role is played by the dipole-dipole interaction,
which leads to a substantial increase of the repulsion between the branches of
the spectrum. The influence of the dissipative effects connected with the
relaxation of the macroscopic wave function of the condensate and the imaginary
part of the polarizability of an atom on the form of the dispersion curves is
investigated.

19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics