New Sensors Open Low Frequencies for Gravitational Waves ⚡ экспресс
Ground-based gravitational observatories lose sensitivity below 20 Hz due to seismic noise. Now, vacuum active isolation systems and laser sensors have been developed, operating at frequencies from 10 mHz. Their precision is 100 times better than LIGO sensors (fractions of a picometer) and does not depend on light polarization; inertial sensors outperform commercial seismometers by five times. Simulations show a tenfold improvement in sensitivity at 10 Hz and a tripling of the detection horizon for intermediate-mass black holes. This is the first experiment opening the path to next-generation ground-based detectors.
Even Einstein predicted gravitational waves — a trembling of the very fabric of spacetime. Today they are captured by gigantic installations like LIGO, created thanks to Rainer Weiss and Kip Thorne. But all of them are a bit deaf to low notes: at frequencies below 20 oscillations per second, earthly shaking—from surf, trains, even walking people—drowns out the signal, like the noise of an orchestra muffling a quiet whisper.
The solution is a system that dampens the tremor, like active noise-canceling headphones, suppressing interference down to one-hundredth of an oscillation per second (10 millihertz). With motion sensors five times more accurate than usual, this gives a tenfold gain at a frequency of 10 hertz. Now we can hear the bass chords of the Universe—mergers of black holes of intermediate mass, thousands of times heavier than the Sun.
This dramatic leap will not only triple the search radius (volume — almost 30 times), but also possibly show whether supermassive black holes at the centers of galaxies grow from such "seeds".
🎯 Low-frequency gravitational waves are the only messenger from black holes with masses from hundreds to hundreds of thousands of suns; these "golden means" have hidden from all telescopes.
🎬 Like in 'Interstellar': the instruments sensed how space trembled from distant black holes. Now we hear that tremor with unimaginable clarity.