Speaker
Description
Axionlike dark matter may generate an oscillating pseudomagnetic field
through its gradient coupling to fermion spins. We report on the results
of a recent search [1] for this interaction using a
radio-frequency $^{87}\mathrm{Rb}$ atomic magnetometer, whose Larmor
frequency is scanned to provide broadband sensitivity. The measurement
probes axionlike-particle (ALP) masses between
$2.40\times10^{-10}$ and $2.11\times10^{-9}\,\mathrm{eV}/c^{2}$.
The recorded magnetic field spectra are searched for features consistent
with an ALP-induced signal. In the absence of significant ALP candidate
signals, we derive limits on the ALP couplings to protons, neutrons, and
electrons. The proton result improves on previous laboratory constraints
in the investigated mass range, while the neutron and electron limits
provide complementary bounds. These results demonstrate the applicability
of radio-frequency atomic magnetometers to broadband searches for
axionlike dark matter.
[1] A. Rigoulet, S. Nanos, I. K. Kominis, and D. Antypas, Phys. Rev. D 113, 072011 (2026).
| Primary Abstract Topic | Experiment: Axions and Wave-Like-DM |
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