- #1
m4r35n357
- 658
- 148
When I first started learning about GR, I understood that a vacuum solution is one where the Einstein tensor vanishes, for the simple reason that the stress-energy tensor, T, vanishes. I have since read many times that the Ricci tensor vanishes for a vacuum solution. I am confused because to me this means that the scalar curvature is zero, and if there is no curvature, surely the space is flat?
I would appreciate it if someone could put me straight on this simple (I hope) misunderstanding.
I would appreciate it if someone could put me straight on this simple (I hope) misunderstanding.