- #1
- 3,507
- 27
What are the symmetries determined by FRW spacetime? I guess they include Lorentz symmetry, rotationally and translationally symmetries, but not time symmetry. Is this right?
Thanks
Thanks
What are the symmetries determined by FRW spacetime? I guess they include Lorentz symmetry, rotationally and translationally symmetries, but not time symmetry. Is this right?
Thanks
Lorentz transformations are defined locally, not globally.
I don't think conformal flatness connects in any way to Lorentz transformations.
A little addition: this translation vector generally has a different proper length in each spatial slice. What's constant is its comoving length.3 translations (homogeneity)