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Dark matter and energy

Dark matter and energy

Axion clouds around neutron stars could reveal dark matter origins

04 Nov 2024
Diagram showing a blue neutron star at the centre of magnetic field lines and a yellow-green cloud representing a haze of axions. While some axions escape, and are represented by a red squiggly arrow pointing outwards, others become bound and interact with the magnetic field, producing photons (represented by blue squiggly arrows pointing outwards).
Cloudy with a chance of axions: An axion cloud around a neutron star. While some axions escape the star’s gravitational pull, many remain bound to the star. Over a long period of time, a cloud of axions forms and interacts with the neutron star's strong magnetic field. This causes some axions to convert into radiofrequency photons that telescopes on Earth could detect. (Courtesy: University of Amsterdam)
Hypothetical particles called axions could form dense clouds around neutron stars – and if they do

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Martijn Boerkamp is a science writer based in the Netherlands
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