Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Axion Structure Formation I: The Co-motion Picture   Axions as dark matter is an increasingly important subject in astrophysics
and cosmology. Experimental and observational searches are mounting across the
mass spectrum of axion-like particles, many of which require detailed knowledge
of axion structure over a wide range of scales. Current understanding of axion
structures is far from complete, however, due largely to controversy in
modeling the candidate's highly-degenerate state. The series Axion Structure
Formation seeks to develop a consistent model of QCD axion dark matter dynamics
that follows their highly-degenerate nature to the present using novel modeling
techniques and sophisticated simulations. This inaugural paper presents the
problem of describing many non-relativistic axions with minimal degrees of
freedom and constructs a theory of axion infall for the limit of complete
condensation. The derived model is shown to contain axion-specific dynamics not
unlike the exchange-correlation influences experienced by identical fermions.
Perturbative calculations are performed to explore the potential for imprints
in early universe structures.

22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph