Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Did Gravitational Waves Affect the Evolution of the Universe?   As Cosmologists struggle to understand the evolution of our universe, an
often over-looked element is the affect of gravitational radiation on the
primordial plasma field. This appears to be due to the inaccurate approximation
of the primordial plasma field as a simple hydrodynamic fluid, therefore
neglecting the full dynamics of the magneto-fluid. In this paper, we show how
gravitational waves may have had a significant impact on the evolution of our
universe. While more work is needed, the author hopes to eventually develop a
large-scale simulation of structure formation in the early universe, which
takes the interactions of scalar perturbations, gravitational waves, magnetic
fields and a dynamic plasma field into account.

3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol