Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is Vacuum Decay Significant in Ekpyrotic and Cyclic Models?   It has recently been argued that bubble nucleation in ekpyrotic and cyclic
cosmological scenarios can lead to unacceptable inhomogeneities unless certain
constraints are satisfied. In this paper we show that this is not the case. We
find that bubble nucleation is completely negligible in realistic models.

27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
19
The categories of this paper are: eess
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph