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A complete theory of quantum gravity is needed to determine if gravitons exist and how they relate to gravitational waves.
https://www.fnal.gov/pub/science/inquiring/questions/graviton.html
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A complete theory of quantum gravity is needed to determine if gravitons exist and how they relate to gravitational waves.
https://www.fnal.gov/pub/science/inquiring/questions/graviton.html
Now, it remains to be determined whether it is just the gravitational field propagating at the speed of light or if it is graviton particles moving at the speed of light.