Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the physical (im)possibility of lightsabers   In this paper, we use a science fiction theme (i.e. the iconic lightsaber
from the Star Wars universe) as a pedagogical tool to introduce aspects of
nonlinear electrodynamics due to the quantum vacuum to an audience with an
undergraduate physics background. In particular, we focus on one major problem
with lightsabers that is commonly invoked as an argument to dismiss them as
unrealistic: light blades are not solid and thus cannot be used in a duel as
normal swords would. Using techniques coming from ultra intense laser science,
we show that for high enough laser intensities, two lightsaber blades can
`feel' solid to each other. We argue that this aspect of lightsabers is not
impossible due to limitations of the laws of physics, but is very implausible
due to the high intensities and energy needed for their operation.

27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol