Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmological bounces and Lorentzian wormholes in Galileon theories with
  an extra scalar field   We study whether it is possible to design a "classical" spatially flat
bouncing cosmology or a static, spherically symmetric asymptotically flat
Lorentzian wormhole in cubic Galileon theories interacting with an extra scalar
field. We show that bouncing models are always plagued with gradient
instabilities, while there are always ghosts in wormhole backgrounds.

29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol