Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calculation of the Casimir force between Ge test bodies in different
  theoretical approaches   We calculate the Casimir force between a Ge plate and a Ge spherical lens
with neglected and included free charge carriers. Computations with included
carriers are performed using the Drude, plasma, and diffusion models. It is
shown that the plasma and the Drude models lead to almost identical
computational results, while the results obtained using the diffusion model are
sandwiched between those obtained with neglected charge carriers and with
charge carriers described by the plasma or Drude models.

16
The categories of this paper are: stat
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc