Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spontaneous Freeze Out of Dark Matter From an Early Thermal Phase
  Transition   We propose a new paradigm for the thermal production of dark matter in the
early universe, in which dark-matter particles acquire their mass and freeze
out spontaneously from the thermal bath after a dark phase transition takes
place. The decoupling arises because the dark-matter particles become suddenly
non-relativistic and not because of any decay channel becoming kinematically
close. We propose a minimal scenario in which a scalar and a fermionic
dark-matter are in thermal equilibrium with the Standard-Model bath. We compute
the finite temperature corrections to the scalar potential and identify a
region of the parameter space where the fermionic dark-matter mass
spontaneously jumps over the temperature when the dark phase transition
happens. We explore the phenomenological implications of such a model in simple
cases and show that the annihilation cross section of dark-matter particles has
to be larger by more than one order of magnitude as compared to the usual
constant-mass WIMP scenario in order to accomodate the correct relic abundance.
We show that in the spontaneous freeze out regime a TeV-scale fermionic
dark-matter that annihilates into leptons through s-wave processes can be
accessible to detection in the near future.

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The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci