On 1/28/2025 6:49 AM, Alan Grayson wrote:
I figured you'd jump on my word "separation". You have no idea what I mean? Of course, events with different coordinates are separated in a physical sense. Otherwise they'd have the SAME coordinates! But separated wrt spacetime events means no causal connections; whereas timelike events DO have causal connections. Of course, you know this, so please stop splitting hairs to make an argument. As for relative velocity, if you don't know what I mean, then you don't know what the v means in the gamma function. Again, stop splitting hairs. Oh, about GPS, I will look up this issue, but I was informed of it from a Ph'D in physics from Brent's Ph'D alma mater, University of Texas at Austin. It's surely NOT a distraction if it establishes that results in SR are physically real, not just appearances. AG
There's an unfortunate but common confusion. The un-intuitive aspects of special relativity are physically real, but not it the sense that they//happen to the moving object. If SR predicts length contraction, is the object is really shorter? (1) It's really shorter in the reference frame where it's moving. (2) It's not shorter in it's own frame. And (3) it's a different degree of shorter in other reference frames where it is moving with different velocities. Just looking at (2) people assume that it means (1) and (3) are just appearances. What's true is that *the contraction, /relative/ to things in some reference frame, with respect to which it's moving, is real.
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