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Yes. Or, alternatively, gravitation is curved space-time.CarstenDierks said:So I would like to clarify some questions first:

(1) Gravitation curves spacetime.

No, to both of the above. Gravitational waves are important only under the most extreme conditions. Gravity can, and does exist as a curvature of space-time without the existence of gravitational waves.(2) The curvature of spacetime (associated with gravitation) is only evoked by gravitational waves. A gravitational wave can constitute, aggravate, impair or erase the curvature.

(3) Every change in the extent of the curvature has to be evoked by a gravitational wave.

Think of electrostatics. A pair of unlike charges attract each other. It is not necessary for an actual electromagnetic wave to exist for like charges to attract. Do not confuse actual electromagnetic waves with 'virtual" particles or waves.