On Tue, Jan 28, 2025 at 8:54 PM Alan Grayson <[email protected]> wrote:
> > > On Tuesday, January 28, 2025 at 2:56:32 PM UTC-7 Brent Meeker wrote: > > > > > 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. *Brent > > > *It's a baffling result. The LT doesn't tell us what will be MEASURED in a > moving target frame being observed from a rest frame wrt length contraction > and time dilation, so the result is just an APPEARANCE from the pov of the > rest frame; and yet, from the pov of GPS clocks, these effects are real and > measureable. This was the conclusion I argued, which is why I referenced > the GPS clocks. * > > Brent's comment wasn't saying there was any disagreement between what coordinates the LT predicts for a given frame and what is really true (or really measured) in that frame, just like I wasn't saying that (see my last response above). You're really deluding yourself by rushing to read every explanation people give you as confirmation of your pre-existing fixed opinions. Jesse -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAPCWU3JmV0OQiOXn7ZYedokfyVU%2BzQSEm_FucZZVOx%3DrHxtX%2Bg%40mail.gmail.com.
