A Trap for Dark Matter Particles ⚡ экспресс
A new broadband method for hunting axions—those elusive dark matter particles—has been proposed. It relies on quantities tied to the square of the axion field. The trick: tune a superconducting quantum interference device (SQUID) to a sweet spot where voltage depends quadratically on magnetic flux, then use synchronous detection to hush low-frequency noise. This setup can fish for axions across an astonishing mass range—spanning over 15 orders of magnitude—with a sensitivity around 10^{-16} GeV^{-1}, crushing existing limits by orders of magnitude. Like a net that traps particles of any 'size,' this approach can be adapted to search for other dark matter candidates too.
Dark matter has eluded direct observation so far, even though its gravity holds galaxies together. One hypothesis: it’s made of axions—ultra-light particles predicted by theory.
The new method employs a quantum magnetic sensor (SQUID) that feels the slightest field changes—like an antenna tuned to cosmic whispers. To weed out interference, the field is modulated in a specific way: then the axion signal appears as a barely noticeable ripple against the noise. But the real genius is the enormous search bandwidth. The device scans a huge frequency interval, covering possible axion masses across a factor of 10¹⁵—that’s like looking for a needle not in a haystack, but throughout the entire Solar System. For comparison, a typical radio receiver spans a range of only a millionfold. This approach turns the detector into a kind of dark-matter spectroscope, analyzing not light but magnetic vibrations. The expected sensitivity is orders of magnitude better than current experiments and is nearly independent of the axion mass. The setup can also search for other candidates, such as dark photons.
🎯 Axions are so light that their mass is trillions of times less than an electron’s. But if they fill the Universe, their collective weight neatly explains why galaxies spin faster than they should.