Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Cosmological Evolution of Light Dark Photon Dark Matter   Light dark photons are subject to various plasma effects, such as Debye
screening and resonant oscillations, which can lead to a more complex
cosmological evolution than is experienced by conventional cold dark matter
candidates. Maintaining a consistent history of dark photon dark matter
requires ensuring that the super-thermal abundance present in the early
Universe $\textit{(i)}$ does not deviate significantly after the formation of
the CMB, and $\textit{(ii)}$ does not excessively leak into the Standard Model
plasma after BBN. We point out that the role of non-resonant absorption, which
has previously been neglected in cosmological studies of this dark matter
candidate, produces strong constraints on dark photon dark matter with mass as
low as $10^{-22}$ eV. Furthermore, we show that resonant conversion of dark
photons after recombination can produce excessive heating of the IGM which is
capable of prematurely reionizing hydrogen and helium, leaving a distinct
imprint on both the Ly$-\alpha$ forest and the integrated optical depth of the
CMB. Our constraints surpass existing cosmological bounds by more than five
orders of magnitude across a wide range of dark photon masses.

27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg