Gravitational Echo Will Reveal the Number of Primordial Black Holes ⚡ экспресс
Original: "Testing supermassive primordial black holes with lensing signals of binary black hole merges"
By analyzing gravitational echo delays, astronomers will count invisible primordial black holes.
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The same gravitational signal from a black hole merger can reach us twice or even three times—like an echo off invisible “mountains” of dark matter. By analyzing these repeats and their delays, scientists have come up with a way to count ancient supermassive black holes, even if they never emit light. The new method promises to constrain their numbers more precisely than imaging entire galaxies.
🎯 A primordial black hole can be the size of an atom, yet as massive as a mountain, and its gravitational echo can reach us from the other end of the universe.