Dark matter stars mimic black holes ⚡ экспресс
Scientists studied a compact object spiraling into a supermassive boson star (a hypothetical body made of dark matter). Unlike black holes, such a system emits scalar radiation due to dynamical friction, altering the orbit. It turns out the resulting gravitational-wave signal closely mimics the chirp (a rising howl) of merging black holes, even if the star isn't too dense. The signal's character depends on the central star's compactness: very dense ones cause a sharp plunge, while diffuse ones lead to a gradual inspiral. Future detectors like LISA will distinguish these "fakes" by a phase shift in the wave.
A star made of dark matter is an invisible ocean of ultra-light particles, whose existence was first suspected by Fritz Zwicky back in the 1930s. Into this ocean plunges a neutron star — a tiny, yet unimaginably dense sphere. Friction with the dark matter, like moving through water, accelerates its fall towards the center. As it sinks, the fabric of space itself ripples, producing gravitational waves.
This process generates a "chirp" — a signal indistinguishable from the merger of two black holes. But the ending gives the impostor away: for black holes, the tone fades out smoothly, whereas for a dark star it cuts off abruptly, like a boat sinking to the bottom. Future detectors, such as LISA, will be able to spot these fakes.
🎯 A boson star could be bigger than Pluto’s orbit, yet so diaphanous that an astronaut flying through it would feel only a faint extra weight.