Neutrino from the Cradle: The Secret of the Early Universe ⚡ экспресс
A new explanation for the record-breaking neutrino caught by KM3NeT ties it to the decay of hypothetical long-lived particles leftover from the Big Bang. Instead of the usual assumption of a smooth power-law spectrum, this model predicts a sharp spike at the event's energy, which eases the conflict with IceCube's lack of a signal. Calculations that factor in interactions with the cosmic neutrino background and radiation from the decay show the idea works if these particles were born during the recombination epoch or later. And the cherry on top? This scenario might leave a detectable imprint on the cosmic microwave background for future telescopes.
Neutrinos are almost elusive particles: they zip through planets without noticing atoms. So every catch is a stroke of luck. Recently, the underwater detector KM3NeT snagged a neutrino with energy millions of times greater than Earth's most powerful accelerators can produce. A new study suggests: it's not a visitor from a distant galaxy, but a message from the early Universe. The particle was born when the world was only 380,000 years old, right after it became transparent.
This explains the silence of other observatories: the message is heard only at one energy. On its way to us, the neutrino collided with other neutrinos, and its energy changed. Such encounters could have left an imprint on the cosmic microwave background — the afterglow of the Big Bang, stretched by the Universe's expansion.
If the theory is correct, this lonely message will allow us to peer into the era of the first atoms and even deeper.
🎯 Every second, trillions of solar neutrinos pass through your body without causing the slightest harm.
🎬 Like in Arthur C. Clarke's 'Space Odyssey', where a mysterious signal comes from an unimaginable past.