Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum fluctuations of lightcone in 4-dimensional spacetime with
  parallel plane boundaries   Quantum fluctuations of lightcone are examined in a 4-dimensional spacetime
with two parallel planes. Both the Dirichlet and the Neumann boundary
conditions are considered. In all the cases we have studied, quantum lightcone
fluctuations are greater where the Neumann boundary conditions are imposed,
suggesting that quantum lightcone fluctuations depend not only on the geometry
and topology of the spacetime as has been argued elsewhere but also on boundary
conditions. Our results also show that quantum lightcone fluctuations are
larger here than that in the case of a single plane. Therefore, the confinement
of gravitons in a smaller region by the presence of a second plane reinforces
the quantum fluctuations and this can be understood as a consequence of the
uncertainty principle.

31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ