Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collective excitations of graphene excitons being in the Bose-Einstein
  condensate state   Bose-Einstein condensation of the excitons in graphene is considered. We
suggested the model spinor equation for neutral particles with short range
interaction described the microscopic graphene excitons dynamic. Using this
equation we derived quantum hydrodynamic equations for description of
collective properties of excitons in graphene, particularly for the case when
excitons being in the Bose-Einstein condensate (BEC) state. The dispersion of
collective excitations in graphene excitons BEC is studied. We shown that
frequency of collective excitations is proportional to the square root of the
wave vector module: $\omega\sim \sqrt{k}$.

22
The categories of this paper are: chao-dyn
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
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph