Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong bound on canonical ultra-light axion dark matter from the
  Lyman-alpha forest   We present a new bound on the ultra-light axion (ULA) dark matter mass
$m_\text{a}$, using the Lyman-alpha forest to look for suppressed cosmic
structure growth: a 95% lower limit $m_\text{a} > 2 \times
10^{-20}\,\text{eV}$. This strongly disfavors ($> 99.7\%$ credibility) the
canonical ULA with $10^{-22}\,\text{eV} < m_\text{a} < 10^{-21}\,\text{eV}$,
motivated by the string axiverse and solutions to possible tensions in the cold
dark matter model. We strengthen previous equivalent bounds by about an order
of magnitude. We demonstrate the robustness of our results using an optimized
emulator of improved hydrodynamical simulations.

12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph