Scientists don't know exactly where neutron stars end and black holes begin. Between 2 and 5 solar masses lies a mysterious 'gap,' virtually empty of known objects. But gravitational waves whisper that something's there. Like a perceptive chef, a neural network can quickly sniff out from a merger signal whether a system harbors a body from this 'mass gap' — and thus predict a flash of light. What lurks in this dark zone?
When black holes or neutron stars merge, they strum space, broadcasting gravitational waves—a chirp predicted by Einstein. Detectors like LIGO capture this cosmic ringtone, its pitch encoding the masses. Yet, there's a silent interval in the cosmic scale: objects from 2 to 5 Suns are almost never heard. This lower mass gap lies between the heaviest neutron stars and lightest black holes.
GWSkyNet-MassGap, a neural network, listens to the gravitational wave chirp and judges if a merger includes a neutron star or a gap object—like naming instruments in an orchestra. It's accurate for loud signals but can mishear the mass split in faint ones. If neutron stars collide, telescopes catch a kilonova forging gold; black hole mergers stay dark. Sifting gravitational wave catalogs, it spotlights rare candidates. The gap may hide surprises—perhaps quark-matter ghosts that are neither star nor hole.
🎯 A sugar-cube-sized lump of [tag:neutron_star]neutron star[/tag] matter would outweigh Mount Everest, making it the universe's densest known material outside a black hole.