Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Cosmology   Quantum cosmology in general denotes the application of quantum physics to
the whole universe and thus gives rise to many realizations and examples,
covering problems at different mathematical and conceptual levels. It is
related to quantum gravity and more specifically describes the application to
cosmological situations rather than the construction and analysis of quantum
field equations. As there are several different approaches to quantum gravity,
equations for quantum cosmology are not unique. Most investigations have been
performed in the context of canonical quantization, where Wheeler--DeWitt like
equations are the prime object. Applications are mostly conceptual, ranging
from possible resolutions of classical singularities and explanations of the
uniqueness of the universe to the origin of seeds for a classical world and its
initial conditions.

9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs