Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new Concept of Ball Lightning   We suggest that the ball lightning (BL) is a weakly ionized gas, in which the
electromagnetic radiation can be accumulated through the Bose-Einstein
condensation and/or the photon trapping in the plasma density well. We derive
the set of equations describing the stability of BL, and show that the BL
moving along charged surface becomes unstable. Eventually the instability leads
to explosion of BL and release of energy of the trapped photons and/or the
Bose-Einstein condensate.

2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph