On Tue, Jan 28, 2025 at 8:54 PM Alan Grayson <agrayson2...@gmail.com> 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 everything-list+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAPCWU3JmV0OQiOXn7ZYedokfyVU%2BzQSEm_FucZZVOx%3DrHxtX%2Bg%40mail.gmail.com.
