Those earthquakes are huge, but not large enough to explain the change in earth's rotation. But, the rotation has changed a lot, that's the activity...
They also need to be non-collisional, difficult to ionise, have completely different composition to the rest of the universe and mysteriously stable....
Thanks. I should probably add, though, that if we discover some underlying principle that allows us to predict the changes we need to make to GR and...
Photons are massless. So this is a solution only for the unphysical case of zero energy since you have dropped the relevant bit for photons which is...