"If a collision of two black holes was powerful enough to create a tunnel between universes, the gravitational signal could pass down the wormhole's throat into our cosmos. Since the wormhole would only be open for a very short time, this would explain why GW190521 seems to cut off abruptly. Although their modelling suggests this scenario isn't very likely, Dr Lai says evidence cannot rule out that the signal travelled to Earth from another universe."
"Gravitational waves are ripples in the fabric of space and time, usually created when massive, dense objects like black holes collide. But at less than a tenth of a second long, this sudden burst was far shorter than the drawn-out chirps normally produced by merging black holes. What makes GW190521 so unusual is that it is missing the rising part of the sig"
A gravitational-wave detector recorded a burst, GW190521, lasting less than a tenth of a second. The burst lacked the rising chirp typical of binary black hole mergers. Gravitational waves are ripples in spacetime produced when massive objects such as black holes collide. Merging binary black holes usually produce a rising chirp as they spiral together. About 300 binary black hole collisions have produced such drawn-out chirps. One hypothesis proposes that a black hole collision could create a transient wormhole connecting universes, allowing the signal to pass briefly through its throat. The short opening of a collapsing wormhole could explain the abrupt cutoff, though modelling suggests this scenario is unlikely but cannot be fully ruled out.
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