Dark Stars: First Light from Invisible Matter ⚡ экспресс
Dark stars are hypothetical objects from the early universe that shine due to the annihilation (mutual destruction) of dark matter particles. In a new study, the cumulative radiation from a population of such stars and the black holes they leave behind has been calculated for the first time. Accounting for thermal glow, annihilation in compressed halos, and emissions from residual dark matter clumps, the authors showed that the total gamma-ray signal could exceed the recorded cosmic background if the mass of dark matter particles does not exceed about 1 TeV. This opens the way to testing the role of dark matter in the birth of the first supermassive black holes through multi-messenger astronomy.
After the Big Bang, the universe was hot and dense. In clumps of dark matter—invisible stuff felt only through gravity—its particles, colliding, annihilated, giving birth to powerful radiation. This hidden heat, like an invisible furnace, warmed gas clouds from within. Colossal dark stars flared up—puffy, sprawling, shining brighter than entire galaxies. When the inner flame died, the star collapsed into a black hole. This mechanism, as Vera Rubin and Fritz Zwicky believed, could have spawned the supermassive holes at the centers of galaxies. Now astrophysicists have modeled the collective light from these giants over the entire history of the universe's expansion. It turns out its faint gamma glow, collected by the Fermi satellite, can be teased out from the background—if the dark matter particles aren't too heavy. This offers a chance to feel out the invisible. And here's an unexpected twist: if such a star were nearby, we'd see it in an ordinary telescope—a bright dot with a bizarre color pattern.
🎯 In an amateur telescope, a dark star would look like a bright dot with an unnatural rainbow hue—like a shard of the early Universe.