Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark-matter spontaneous freeze out   We consider the possibility that thermalized dark-matter particles acquire
their mass thanks to the spontaneous breaking of a symmetry below some critical
temperature. We describe the regime where a freeze out mechanism takes place
shortly after the onset of the phase transition, while the dark-matter mass has
not yet reached its final constant value. For such a "spontaneous freeze out"
to yield the correct relic density, the present-time cross section of
annihilation of the dark matter into Standard-Model states has to be one or two
orders of magnitude larger than in the case of a constant dark-matter mass.

33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys