Theoretical physicists have hit on a new way to test Albert Einstein’s theory of gravity, or general relativity, and—just maybe—probe the distant universe for tiny, hard to detect objects.
But sometimes, such a signal ought to be accompanied by a sizable echo that comes a fraction of a second later, predict Copi and Glenn Starkman, a theorist at Case Western. They consider a compact object such as a white dwarf or a neutron star that lies close to, but not directly on the line of sight to the merging black holes. Using general relativity, they calculate that the gravitational waves scattering off the object canThe physics is subtle.
Other kinds of echoes might be possible. Some physicists have calculated that if general relativity is modified in certain ways by quantum mechanics, then the tail end of the signal from the merger of two black holes should exhibit a pulsing reverberation. But that effect requires new physics and produces a sequence of imperfect echoes. The gravitational glint produces a single, faithful echo of the entire signal, notes Madeline Wade, a gravitational wave physicist at Kenyon College.
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