A new paper suggests how wormholes might be identified with gravitational waves.
In this work, the authors began with a theoretical wormhole between two Universes.
By itself, the wormhole would not emit any gravitational waves.
They then simulated a black hole travelling through the wormhole, spiralling in on one side, and spiralling out and away on the other.
They discovered when a black hole spirals into a wormhole, it creates gravitational waves resembling two black holes merging.