Dark Matter Gave Rise to Galactic Magnetic Fields ⚡ экспресс
In a new model, dark matter is not made of particles but a super-light field linked to electromagnetism. At the moment the universe became transparent (the epoch of recombination), oscillations of this field triggered a tachyonic instability — an exponential growth of magnetic fields, much like how a microphone starts to screech from audio feedback. As a result, magnetic fields emerged that we now observe in galaxies and clusters. Thus, the hypothetical dark matter field turns out to be the source of cosmic magnetism.
Without the invisible framework of dark matter, galaxies would fly apart. Astronomer Vera Rubin proved back in the 1970s that stars rotate as if held by an unseen mass. But new research shows it's not just passive ballast. If dark matter is an ultralight field, then in the young universe it generated giant magnetic fields.
Right after the Big Bang, in the era of the first atoms, this field began oscillating in a single rhythm. Like a microphone catching its own feedback from the speakers, the slightest trembling of dark matter repeatedly amplified faint magnetic fields. A quiet hum turned into a deafening howl—the fields grew to the scale of entire galaxies.
Thus the cosmos acquired a magnetic framework, whose measured strength matches predictions. What's even more astonishing: a dark matter particle may be billions of times lighter than an electron, but their collective trembling filled the Universe with magnetism.
🎯 The magnetic field of our Milky Way galaxy is about 1000 times weaker than Earth's, yet it arranges dust grains into beautiful spiral patterns.