Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How quantum is the big bang?   When quantum gravity is used to discuss the big bang singularity, the most
important, though rarely addressed, question is what role genuine quantum
degrees of freedom play. Here, complete effective equations are derived for
isotropic models with an interacting scalar to all orders in the expansions
involved. The resulting coupling terms show that quantum fluctuations do not
affect the bounce much. Quantum correlations, however, do have an important
role and could even eliminate the bounce. How quantum gravity regularizes the
big bang depends crucially on properties of the quantum state.

1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas