(November 3, 2014 at 12:19 pm)little_monkey Wrote:At the large r limit (when the source is very very far away from the observer) the gravitational redshift are identical for identical stars. It doesn't matter that one of the one of the stars is 100 billion lightyears further away. Read the link I provided and look at the 2nd equation in the article.(November 2, 2014 at 1:25 pm)Surgenator Wrote: If we took two identical stars that are at different distances from us, the amount of gravitational redshift should still be the same if we're sufficiently far away. If the universe was not expanding, then this gravitation redshift would be the main component for the redshifts and we would see the same redshift. However, we see different redshifts.
The gravitational redshift depends on the difference of the gravitational potential. If two identical stars are at different distances, they will be in different gravitational potential, hence will exhibit diffrent redshifts.
little_monkey Wrote:Two words: statelite galaxies. If the masses of each galaxies would be the same, then you shouldn't have any satellites. A satellite requires a central mass that is much heavier than itself to orbit around.Surgenator Wrote:Also, if you look at whole galaxies that have different total mass but are at the same distance away from you, you would expect different amount of redshift if the universe was not expanding. We see the same amount.
If you look at equation 10, d = H Δv, you need to know the mass and the size of the source. And so my argument is that this will be the same for every galaxy. I've put an appendix on my blog to illustrate that. Check it out again: http://soi.blogspot.ca/
Your claim doesn't hold up to the observations.