- #1
- 4,131
- 1,732
I have just been reading about the Milne model of the universe, which is a version of the FLRW model with zero mass-energy everywhere and negative curvature.
This perplexes me a little as my understanding is that if there is no mass-energy the Einstein tensor will be uniformly zero, which I thought (but am not sure) implied that the Riemann curvature tensor would be uniformly zero. Hence if the Milne universe has negative curvature it would not be compatible with the field equation.
Am I misunderstanding something here?
This perplexes me a little as my understanding is that if there is no mass-energy the Einstein tensor will be uniformly zero, which I thought (but am not sure) implied that the Riemann curvature tensor would be uniformly zero. Hence if the Milne universe has negative curvature it would not be compatible with the field equation.
Am I misunderstanding something here?