Each statement here is more of a question than a comment.
Comoving observers are those whose velocity vectors are unit normals to the Milne foliation of hyperboloids. That is, the homothetic vector field in Minkowski corresponding to scaling.
We can use them as the right vector field to ...
Comoving observers are those whose velocity vectors are unit normals to the Milne foliation of hyperboloids. That is, the homothetic vector field in Minkowski corresponding to scaling.
We can use them as the right vector field to ...
Comments
And then the real thing that I'm confused by, is that if we have a kind of "obvious" rescaling time translation vector field. Is there an analogue for linear translations to measure a rescaled momentum?