Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Casimir effect and vacuum energy   Vacuum fluctuations have observable consequences, like the Casimir force
appearing between two mirrors in vacuum. This force is now measured with good
accuracy and agreement with theory. We discuss the meaning and consequences of
these statements by emphasizing their relation with the problem of vacuum
energy, one of the main unsolved problems at the interface between
gravitational and quantum theory.

19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin