Detecting Extragalactic Axion-like Dark Matter with Polarization Measurements of Fast Radio Bursts
arxiv(2024)
摘要
Axions or axion-like particles (ALPs) are one of the most promising
candidates of dark matter (DM). A prevalent method to detect axion-like DM is
to seek the periodic oscillation feature in the polarization angles of linearly
polarized light emitted from astrophysical sources. In this work, we use the
time-resolved polarization measurements of the hyperactive repeating fast radio
burst, FRB 20220912A, detected by the Five-hundred-meter Aperture Spherical
radio Telescope (FAST) to search for extragalactic axion-like DM for the first
time. Given a DM density profile of FRB 20220912A's host, we obtain upper
limits on the ALP-photon coupling constant of g_a γ<(2.9 ×
10^-11-1.1× 10^-9) GeV^-1 for the ALP masses m_a ∼
(1.4×10^-21-5.2×10^-20) eV. Persistent polarimetric observations
with FAST would further improve the constraints. We prove that FRBs offer an
alternative way to detect axion-like DM on extragalactic distance scales,
complementary to other galactic DM probes.
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