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Related Experiment Video

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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

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Published on: July 30, 2020

Extraterrestrial Axion Search with the Breakthrough Listen Galactic Center Survey.

Joshua W Foster¹, Samuel J Witte², Matthew Lawson^3,4

¹Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters

|January 6, 2023

Summary

Researchers searched for axion dark matter signals from neutron stars using radio telescope data. No evidence was found, but the study sets new limits on axion properties, excluding certain values for axion-photon coupling.

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Area of Science:

Astrophysics
Particle Physics
Cosmology

Background:

Axion dark matter (DM) can convert to photons in neutron star (NS) magnetospheres, producing radio signals.
This conversion is resonant, dependent on the axion mass and plasma frequency within the NS magnetosphere.

Purpose of the Study:

To search for evidence of axion-photon conversion from neutron stars in the Galactic Center.
To constrain the properties of axion dark matter, specifically the axion-photon coupling.

Main Methods:

Utilized archival Green Bank Telescope data from the Breakthrough Listen survey of the Galactic Center.
Employed data-driven models of neutron star populations and advanced ray tracing simulations to predict radio flux.
Analyzed spectral data for signatures of axion-induced radio emission.

Main Results:

No evidence for axion dark matter signals was detected.
Established leading constraints on the axion-photon coupling constant (g_{aγγ}).

Conclusions:

Excluded axion-photon coupling values down to approximately 10^{-11} GeV^{-1} for dark matter axions with masses between 15 and 35 μeV.
Demonstrated the utility of high-frequency resolution radio data for axion searches.