HomePhysicsAttempting to find Axions within the Galactic Middle

# Attempting to find Axions within the Galactic Middle

&bullet; Physics 15, s163

A neutron star’s ultrastrong magnetic subject may create the circumstances for uncloaking a promising darkish matter candidate.

One strategy to detecting axions is to use a powerful magnetic subject to a microwave cavity after which search for a predicted sign of axions changing into photons. In 2009 a pair of astronomers proposed that this conversion may additionally happen within the plasma threaded by a neutron star’s ultrastrong magnetic subject. The conversion is predicted to manifest as a slender, radio-frequency emission line whose actual frequency is determined by the axion mass and whose amplitude is determined by the axion density.

The anticipated sign is past the attain of present telescopes. Nevertheless, in 2020 the Massachusetts Institute of Expertise’s Joshua Foster and his collaborators demonstrated that it’s potential to derive helpful higher limits on the power of axion-photon conversion by searching for the sign the place it’s prone to be strongest: the Galactic Middle.

Now the identical group has seemed for that sign in information gathered throughout a seek for signatures of clever extraterrestrial life. They study the next and wider vary of axion mass than earlier than (15–35

$𝜇$

eV versus 5–11

$𝜇$

eV) and use a extra detailed mannequin of the neutron star inhabitants. Proof of axions stays elusive, however the brand new interaction-strength certain is extra stringent.

–Charles Day

Charles Day is a author and editor primarily based in Washington, DC, and the previous editor in chief of Physics In the present day.

## References

1. J. W. Foster et al., “Extraterrestrial axion search with the Breakthrough Pay attention Galactic Middle survey,” Phys. Rev. Lett. 129, 251102 (2022).

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