[General] JW on STR twin Paradox

[Albrecht Giese]

Grahame,

so as you have explained 'reciprocity' here, it is also my understanding.

Sorry, I missed your book. Can you please give me a reference (if it is 
in the internet) or the exact title and editor, if it is only available 
as a hard copy?

One question in advance: Does the book also cover GRT? And if this is 
the case, is it also based on a fixed frame, so that it assumes 
something like an ether?

Best regards
Albrecht


Am 08.07.2017 um 14:01 schrieb Dr Grahame Blackwell:
> Albrecht,
> I'd agree with all that you say here.  I'd add just one reminder, of 
> what we've talked about before.
> For the 'unique absolute rest frame' to fully stand up to scrutiny in 
> the light of experimental findings of SR, it's not only necessary to 
> show that an observer in a moving frame would be led to believe from 
> observation that their frame is static - it's also necessary to show 
> that this moving observer would perceive the SAME degree of (a) time 
> dilation and (b) length contraction in the absolutely static frame as 
> would be seen from that static frame in the observer's frame (those 
> two effects are of course NOT objective realities in the static frame, 
> they are perceived by the moving observer as a consequence of their 
> OWN motion).
> To show that the moving observer perceives themself as static is 
> relatively (!!) easy; to show that they perceive an actually-static 
> frame as subject to relativistic effects takes a little more thought - 
> but it can be done, and shown to be so.  [This is what I have referred 
> to previously as 'reciprocity'.]
> In addition, of course, it needs to be - and CAN be - shown how EVERY 
> experimental finding that's considered to be evidence for frame 
> symmetry can be fully explained without any need for, or reference to, 
> frame symmetry.
> No paradoxes - just a little more thought than most physicists appear 
> to have wished to put into explaining the 'how' of Relativity (which 
> is what I always thought physics was actually about - explaining the 
> 'how'?)
> All of this is shown in detail in my latest book, published last year.
> Best regards,
> Grahame
>
>     ----- Original Message -----
>     *From:* Albrecht Giese <mailto:phys at a-giese.de>
>     *To:* general at lists..natureoflightandparticles.org
>     <mailto:general at lists.natureoflightandparticles.org>
>     *Sent:* Friday, July 07, 2017 9:06 PM
>     *Subject:* Re: [General] JW on STR twin Paradox
>
>     Chip,
>
>
>     I also think that it is the easiest and most physical way to
>     understand relativity in general and dilation in particular, if
>     one assumes that there is an absolute frame of rest, and that the
>     motion with respect to this frame causes (among other phenomena)
>     dilation. But it is a specific property of relativity that every
>     observer in any inertial frame can assume that his frame is the
>     frame at rest. And in his observation the physical world behaves
>     indeed as if his frame would be the absolute frame at rest.
>
>
>     This sounds like a paradox at the first glance. But with a proper
>     use of the Lorentz transformation it can be explained why it is
>     this way. It is a bit of work to make these calculations, but it
>     is possible and one may say that this work is a necessity to
>     understand special relativity.
>
>
>     Albrecht
>
>
>
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