[ Instrument Network Instrument Development ] Recently, according to foreign media reports, it is believed that dark matter is all around us (if it exists), but the fact that it is invisible makes it difficult to find. Researchers at Stockholm University did not try to observe it. Instead, they designed an experiment and used the so-called "axle radio" to "listen" to it.
More than 85% of the material in the universe is unknown, and only through the gravitational interaction with conventional materials. This mysterious thing is called dark matter, but it has not yet been discovered directly, but this is not a lack of experimentation. Scientists have conducted many different experiments over the years to try to pick up signals from various proposed dark matter particles.
In recent years, HADES particle detectors have eliminated the possibility of "dark photons", and LUX and XENON1T have also ruled out certain types of weakly interacting large mass particles (WIMP).
However, one possible explanation is an imaginary elementary particle called an axon. It is believed that the axons will not be discrete particles, but behave like waves in the entire space and rarely interact with normal matter. In particular, the axons are thought to be weak (but detectable) with the interaction between electricity and magnetism, which may be the way they ultimately express themselves.
Researchers in Stockholm have designed a new experiment to listen to such interactions. The detector will consist of a chamber containing a cold plasma, the wires of which are thinner than a single hair. This will be wrapped in a large, powerful magnet.
The idea is that in this magnetic field, any passing axis will produce a small electric field. This, in turn, will drive the oscillations in the plasma and then detect it as evidence of the axis itself. By bringing these wires together or apart, you can tune the device like a radio to find the correct azimuth frequency.
Matthew Lawson, author of the study, said: “Without a cold plasma, the axis cannot be effectively converted into light. The plasma plays a dual role, creating an environment that allows for efficient conversion and a resonant plasmon. Collect the energy of the converted dark matter."
This design is different from previous attempts to find the axis. A few years ago, nEDM experiments examined whether neutrons in a highly controlled environment that was undisturbed would change their spin over time. If so, this may be evidence of the discovery of the axis. Another experiment called ABRACADABRA used a ring magnet. Technically, there should be no magnetic field in the center - but if the axes are ubiquitous, they may generate magnetic fields in the area.
Both of these experiments failed to achieve the desired results. But the invalid result does not necessarily exclude the existence of the axis - and may mean that the quality of the axis may be small, or the interaction is weak. The advantage of the new experimental design is that the cold plasma amplifies any potential signals and therefore these weak interactions can be detected. Researchers say their systems can also be expanded relatively easily.
The study's author, Alexander Miller, said: "This is a completely new way of looking for dark matter, which will help us find one of the strongest dark matter candidates in a completely undeveloped area. Building a tunable plasma will make us Ability to perform larger experiments than traditional techniques to produce stronger signals at high frequencies."
Although the design is still theoretical, the concept has been developed in actual experiments based on this idea.
The study was published in the Physical Review Letters.
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