Researchers from the United States have presented a new technique that will allow you to find signs of dark matter by sound. This will help fill in the gaps in previous observations.
Physicists at Stanford University and the SLAC laboratory have created a device that will detect dark matter that researchers cannot see in other ways. They have not yet specified which theoretical particles, in their opinion, they will be able to find – hidden photons or small bursts – axions.
The Dark Matter Radio project will search for hidden photons in a specific frequency range, methodically turning the dial to search for waves that particles can emit. The second version of the device will look for signs of axions in the same way.
Scientists note that this is not ideal, but it will help close the observation gaps. For example, some subatomic particles are too small, while others are too large – they can only be detected by colliding with other matter. The rest of the particles behave so subtly that they are easier to detect as a wave, because they are scattered in space.
To amplify any signal the Pathfinder receives, the engineers installed a hexagonal niobium plate shield covering all other components – they work like a capacitor. The amplified signal is then transmitted to a SQUID (Superconducting Quantum Interference Device) quantum sensor, a technology invented by the Ford Motor Company in the 1960s. SQUID is located at the bottom of the radio receiver, measures and records any signals.
The less the expected mass of the axion, the more elusive this particle becomes, since its interaction with ordinary matter is proportional to its mass. Therefore, it is important that the next generation of DM Radio becomes even more sensitive. Moreover, the increase in the sensitivity of the device should be significant, since the mass of these particles is from a trillionth to a millionth of an electronvolt, and an electronvolt is about a billionth part of the mass of a proton.