Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bouncing Cosmology made simple   We introduce the "wedge diagram," an intuitive way to illustrate how
cosmological models with a classical (non-singular) bounce generically resolve
fundamental problems in cosmology. These include the well-known horizon,
flatness, and inhomogeneity problems; the small tensor-to-scalar ratio observed
in the cosmic microwave background; the low entropy at the beginning of a hot,
expanding phase; and the avoidance of quantum runaway. The same diagrammatic
approach can be used to compare with other cosmological scenarios.

15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th