January 3, 2023
local simultaneity, universal simultaneity, phase difference in synchronization
This short chapter contains a single argument that could have been included as a section in the previous chapter. But the argument is so simple and conclusive that I have found it convenient to devote a chapter of its own to it. Indeed, a flagrant contradiction derived directly from the phase difference in relativistic synchronization (lack of simultaneity) is demonstrated here. The absence of a 'universal now' is one of the most debated aspects of special relativity. The rotating bar argument developed in this chapter demonstrates in a very simple and conclusive way that, indeed, the absence of a 'universal now' is inconsistent. Consequently, we could again consider the possibility of universally simultaneous events and simultaneous processes.
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