Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oscillating Friedman Cosmology   The non-singular, oscillating Friedman cosmology within the framework of
General Relativity is considered. The general oscillatory solution given in
terms of elliptic functions and the conditions for its existence are discussed.
It is shown that the wall-like-matter and the small, but negative cosmological
constant are required for oscillations. The oscillations can , in principle, be
deep enough to allow standard hot universe processes like recombination and
nucleosynthesis. It is shown that the wall-like-matter and string-like-matter
can be interpreted as scalar fields with some potentials. This may give another
candidate for the dark matter which may be compatible with observational data.
For an exact elementary oscillatory solution it is shown that the associated
scalar field potential is oscillating as well.

34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex