Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Casimir force between two impurities immersed in a Bose-Einstein
  condensate   In this paper, we study the problem of an impurity with infinite mass and the
Casimir force between two impurities immersed in a Bose-Einstein condensate.
Our calculation results shows that the Casimir force decays exponentially in
distance at large distance.

16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas