Do Special Relativity effects apply to total recession velocities or to "peculiar velocities"?
I understand (thanks largely to help from this forum) that the primary source for the recession red shift in distant galaxies is the expansion of the space between us and not the relative velocity of the separating objects within that space. It then seems to me that the relativistic effects (time dilation, etc) resulting from this separation apply only to the latter interpretation of the term "velocity" - i.e the peculiar velocity and not the total recession velocity. This would mean that a distant red shift does not necessarily imply significant time dilation differences - only "time cone" perception differences due to the distances involved. Is this correct? Thank you.
Lola - Thanks for the response. I usually understand what you are saying - but... if I choose a reference frame that includes both me and the distant galaxy - then is the relative speed used in the Lorentz Transformation based on the total separation velocity including the stretching of the space between us? (sounds like maybe yes)... If so, why does the speed of light limit not apply to that stretching? Why is it treated differently than "peculiar" velocity - i.e. the relative speed not counting the stretching? Or is the "doppler" red shift equivalent to a gravitational red shift? (sounds like maybe yes, also) - and if this is true, then where does the corresponding spacetime curvature originate? Forgive my ignorance. Too much information..LOL. Thanks again.
Of course, the reference frame itself is stretching - if it is that large - right?