Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for axion-like dark matter with ferromagnets   Existence of dark matter indicates the presence of unknown fundamental laws
of nature. Ultralight axion-like particles are well-motivated dark matter
candidates, emerging naturally from theories of physics at ultrahigh energies.
We report the results of a direct search for the electromagnetic interaction of
axion-like dark matter in the mass range that spans three decades from 12 peV
to 12 neV. The detection scheme is based on a modification of Maxwell's
equations in the presence of axion-like dark matter, which mixes with a static
magnetic field to produce an oscillating magnetic field. The experiment makes
use of toroidal magnets with iron-nickel alloy ferromagnetic powder cores,
which enhance the static magnetic field by a factor of 24. Using SQUIDs, we
achieve a magnetic sensitivity of 150 $\text{aT}/\sqrt{\text{Hz}}$, at the
level of the most sensitive magnetic field measurements demonstrated with any
broadband sensor. We recorded 41 hours of data and improved the best limits on
the magnitude of the axion-like dark matter electromagnetic coupling constant
over part of our mass range, at 20 peV reaching $4.0 \times 10^{-11}
\text{GeV}^{-1}$ (95\% confidence level). Our measurements are starting to
explore the coupling strengths and masses of axion-like particles where mixing
with photons could explain the anomalous transparency of the universe to TeV
gamma-rays.

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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom