Pulsars can be used to find dark matter in a few ways:

• Spin rate Pulsars spin at a steady rate, making them precise clocks. By monitoring the spin of pulsars, researchers can estimate their speed and the gravitational force that dark matter exerts on them. 
• Binary pulsars Binary pulsars can be used to probe ultra-light dark matter. The dark matter field’s coherent oscillations can perturb the dynamics of binary systems. 
• Electric and magnetic fields Pulsars are surrounded by the strongest known electric and magnetic fields in the universe. If dark matter is made of axions, their remnant glow might be visible near pulsars. 

Pulsars are highly magnetized rotating neutron stars that emit beams of electromagnetic radiation. They have short, regular rotational periods, which produce a precise interval between pulses. 

Dark matter makes up about 27% of the universe. The most popular candidate particles for dark matter are Weakly Interacting Massive Particles (WIMPs). Other popular options include hypothetical axions.

This new study proposes a way we might be able to detect the remnant glow of axions. If they exist, axions could be produced in extremely strong magnetic fields, such as those around neutron stars and black holes. The strongest electromagnetic fields are around pulsars, so that would be the best place to look.

How do we detect dark matter

Unlike normal matter, dark matter does not interact with the electromagnetic force. This means it does not absorb, reflect or emit light, making it extremely hard to spot. In fact, researchers have been able to infer the existence of dark matter only from the gravitational effect it seems to have on visible matter

How did scientists discover dark matter

Originally known as the “missing mass,” dark matter’s existence was first inferred by Swiss American astronomer Fritz Zwicky, who in 1933 discovered that the mass of all the stars in the Coma cluster of galaxies provided only about 1 percent of the mass needed to keep the galaxies from escaping the cluster’s

What are pulsars used for

Pulsars have been used to test aspects of Albert Einstein’s theory of general relativity, such as the universal force of gravity. The regular timing of pulsars also may be disrupted by gravitational waves — the ripples in space-time predicted by Einstein and directly detected for the first time in February 2016

Can pulsars support life

Pulsar stars are spinning neutron stars that blast out pulses of radiation, but astronomers believe they may be able to support orbiting habitable planets.

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