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I don't have a lot od time right now but I'll give a short response and then a more detailed one later. I have no real problem with eothr of the sources you quoted. The only thing is that the phrasing used leaves room for misinterpretation by the reader.
When I talked about making a distinction between "actuality" and measurement, I meant just what I said, making a distinction. In Relativity, "What you measure is what you get". Measurement is actuality. What "actually" happens depends upon which frame you are in. The two twins, once brought back into the same frame, agree that their ages differ, They will not agree however, just how this difference was brought about. Nor is there anyway to choose between the twin's separate interpretations of the events leading to the age difference.
This discussion reminds me of the old puzzle. You've probably heard about it. It is the one with the three salesmen, the hotel manager and the bellhop. the gist is that after a series of money transfers, a dollar supposedly comes up missing. The thing is that the "missing dollar" is just an artifice created by the way the end part of the puzzle is worded, The dollar is never really missing.
The simularity, is that your search for what "actually" causes the end time difference is akin to looking for the "missing dollar".
When I talked about making a distinction between "actuality" and measurement, I meant just what I said, making a distinction. In Relativity, "What you measure is what you get". Measurement is actuality. What "actually" happens depends upon which frame you are in. The two twins, once brought back into the same frame, agree that their ages differ, They will not agree however, just how this difference was brought about. Nor is there anyway to choose between the twin's separate interpretations of the events leading to the age difference.
This discussion reminds me of the old puzzle. You've probably heard about it. It is the one with the three salesmen, the hotel manager and the bellhop. the gist is that after a series of money transfers, a dollar supposedly comes up missing. The thing is that the "missing dollar" is just an artifice created by the way the end part of the puzzle is worded, The dollar is never really missing.
The simularity, is that your search for what "actually" causes the end time difference is akin to looking for the "missing dollar".