Rumours swell over new kind of gravitational-wave sighting
This might be a naive question, but I'd like to clear it out.Do gravitational waves travel at the speed of light?I know the theory says nothing can travel faster than light. I also know that photons can be seen as quanta or as waves. So my guess is that gravitational waves travel at most, at the speed of light.But do they? or do they travel slower? faster? Is there a doppler effect for GWs?I ask because I would think ripples in the space-time fabric itself might be a bit different than light waves or other more studied phenomena.Can anyone point me in the right direction?