Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the behaviour of a rigid Casimir cavity in a gravitational field   A detailed investigation is presented of the energy-momentum tensor approach
to the evaluation of the force acting on a rigid Casimir cavity in a weak
gravitational field. Such a force turns out to have opposite direction with
respect to the gravitational acceleration. The order of magnitude for a
multi-layer cavity configuration is derived and experimental feasibility is
discussed, taking into account current technological resources.

11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio