Yes, gravitational waves can be curved by gravitational lensing, similar to electromagnetic waves. Gravitational lensing is a phenomenon where the path of light (electromagnetic waves) or gravitational waves is bent as they pass through the gravitational field of a massive object.
In the case of electromagnetic waves, such as visible light, they are influenced by the gravitational field of massive objects like galaxies or galaxy clusters. The gravitational field causes the path of light to curve, resulting in a distortion of the image of the distant object being observed. This effect is called gravitational lensing and has been observed and studied extensively in astrophysics.
Similarly, gravitational waves, which are ripples in the fabric of spacetime caused by the acceleration of massive objects, can also be affected by the gravitational field of massive objects. When gravitational waves pass through a region with a strong gravitational field, they experience gravitational lensing, causing the path of the waves to deviate from a straight line. This lensing effect can magnify or demagnify the gravitational waves, just as it does for electromagnetic waves.
Gravitational lensing of gravitational waves has not yet been directly observed, primarily because the current detection methods for gravitational waves, such as laser interferometry, are not sensitive enough to detect the subtle distortions caused by gravitational lensing. However, future advancements in gravitational wave detectors and technology may enable the direct observation and study of gravitational lensing effects on gravitational waves.