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Imagine the early Universe as a giant balloon, instantly inflated to incredible size. The tiny bumps on its surface are frozen quantum ripples that later became galaxy clusters. This rapid inflation left behind an ancient glow — a map of the sky that astronomers study.

Hidden in those patterns could be traces of superheavy twin neutrinos. Normally invisible, they might be revealed by a special interaction introduced in new research: like a magnet, it attracts particles with a particular "spin". Then a clear imprint emerges on the celestial sphere, like a watermark.

Finding such an imprint would be a breakthrough. It would prove heavy neutrinos exist and explain why our neutrinos are almost weightless. The secret lies in the seesaw effect: the more massive the invisible twins, the lighter the familiar particles become. The Big Bang turns into a microscope, letting us peer into physics beyond the Standard Model.