Professor Matt Strassler answered most of my questions on his post and the latest observations from Icarus seem to be moving this out of the debate arena into observed facts.
But I am very intrigued by this guys responses John Ryskamp.
It still wonder about this question. And if Professor Matt gives me another great response I may just put this to bed.
Q: Sorry to bother you but you have a great way of speaking down to my level. I still have one question about how Minkowski World lines fit into this. If two observers on two separate World lines were moving in opposite directions from one another at velocities greater than 51% the speed of light. Would either observer notice the other moving at a velocity greater than the speed of light away from them?
Answer from John Ryskamp: Minkowski is predicated on a “natural” coincidence of points. Just ignore Minkowski.
Now that throws me for a loop. I thought that Minkowski World lines are the basis for relativity. So to me John doesn’t want small changes but a wholesale throwing the baby out with the bath water.
John Ryskamp is definitely one learned man and he very well may be onto something. He sounds like a Philosophy Prof I had back in the stone age when I went to college. But I am really hoping Professor Matt answers my question. After a long answer by John I reiterated my question for Prof Matt a slightly different way.
Professor Matt when you get a chance could you answer my second question? I was doing a very simple thought experiment about the big bang and thought that two objects could be moving away from each other at speeds greater than 51% the speed of light after the “Bang”. Observations from the center would never have them going faster than c away for the center. But wouldn’t an Observer from the mass moving in the opposite direction observe the other mass moving at speeds greater than c? Since the mass would be traveling at a constant velocity and there are “no physical experiment (mechanical, electromagnetic, optical—or any physical law whatsoever) that can distinguish between a state of absolute rest and a state of constant velocity.” Relativity would state all laws of physics should be the same for both observers. But wouldn’t they actually be traveling away from each other at greater than c? If this is not true are we not saying that there is one Galilean Space time instead of multiple Minkowski’s 4d versions of space time. I am not arguing the speed of light just that Physical Laws are dependent on the inertial observers frame. I really appreciate your patience with me.
Best Wishes to All
Professor Matt has gone a long way to getting me to understand the errors in my understanding of relativity. I look forward to reading more of his posts.