Dark Matter Is Born from Ghostly Neutrinos ⚡ экспресс
Researchers have found that cold dark matter from sterile neutrinos (particles similar to neutrinos but even more elusive) can be born during the reheating of the Universe after inflation. If the inflaton (the particle that caused the expansion) decays into sterile neutrinos with a probability less than 0.01%, this is enough to explain all dark matter and avoid X-ray constraints. This turns dark matter into a 'probe' of the reheating era: future observations will allow us to extract information about the temperature of those processes. Remarkably, the mechanism works with very weak neutrino mixing, which was previously thought impossible.
Visible matter is a drop in the sea of cosmic soup. The foundation of the Universe is made of invisible dark matter, whose gravity keeps galaxies from flying apart. The best candidate for this role is sterile neutrinos, ghost particles connected to us only by the thinnest of bridges.
Immediately after the Big Bang, space suddenly expanded and became extremely hot. A new model shows: if a tiny fraction of that energy went into creating sterile neutrinos, exactly enough were born to explain all dark matter.
The mechanism solves the mystery of the weak signal from neutrinos, bypassing the limitations of telescopes. Now dark matter becomes a tool: future observatories will be able to measure the temperature of that 'cooking,' peering into the first moments after the Big Bang.
🎯 Sterile neutrinos are so elusive that they could fly through a light-year of lead without ever colliding with an atom.