Abstract
Timelike and spacelike two-event separation is introduced, which characterizes the space-time division. Faster-than-light signals and causality are shown to be inconsistent. We discuss in an essay the related challenges that macroscopic quantum entanglement presents to causality. Time dilation is revisited and the relative age of several travelers is explored; we show that in general the traveler who makes the longest travel before reuniting with others is found to be youngest. For the example of relativistic travel in interstellar space, the distance traveled and time elapsed are introduced for both observer at the base and traveling with the rocket. We show the enormity of time dilation effects for a spaceship capable in its instantaneous rest-frame of a constant Earth gravity equivalent acceleration for an uninterrupted period of several years.
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Notes
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Rafelski, J. (2017). Causality, Twins. In: Relativity Matters. Springer, Cham. https://doi.org/10.1007/978-3-319-51231-0_12
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DOI: https://doi.org/10.1007/978-3-319-51231-0_12
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