In my GR textbook, it states that gravitational waves can undergo interference but not scattering.
I am just starting the chapter on linearised gravity concepts (weak field approximation) and my apologies if this is a duplicate.
My questions are:
Can gravitational waves undergo refraction, as this effect, (at my naive GR level of understanding anyway) is related to the curvature of spacetime.
Is there any intuitive picture of what occurs as a gravitational wave approaches the vicinity of a black hole, but is not scattered.