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“The crucial question there was: Compared to what? The idea that “time suddenly moves more quickly for everyone in the world” isn’t operationally meaningful; we measure time by synchronized repetition, and as long as clocks of all sorts (including biological clocks and clocks defined by subatomic processes) remain properly synchronized, there’s no way you could tell that the “rate of time” was in any way different. It’s only if some particular clock speeds up or slows down compared to other clocks that the concept makes any sense.”
This raises the question: what do we really know about biological clocks in terms of time dilation?
What about other clocks? The choice of this rather peculiar clock was made only because it is one that so clearly depends on a simple electromagnetic phenomena. Other clocks (quartz crystals, springs, even Zoe's biological clock) depend on complicated combinations of electromagnetic phenomena such as the forces between atoms and molecules, and on Newton's laws. If they didn't differ from Jasper's clocks by the same factor of γ, then we would conclude that the laws of mechanics and/or electromagnetism are different between the two frames, contrary to the principle of relativity. So yes, time dilation would affect biological clocks as well, and Jasper thinks that Zoe is getting older more slowly than he is.
Quote from: PmbPhy on 10/06/2016 04:43:37So, in principle, and as far as the physics is concerned, there's absolutely no difference between a biological clock and any other kind of clock. It's only humans that perceive a difference, not nature.I hope this was useful, Bill. "Nice to see you smile and lighten up a bit? Of course you are absolutely correct in that there in no difference between a biological clock, or a cosmic clock like a neutron star, or an oscillating atom or the heart- beat of a human being. All are subject to special relativity!Alan"
So, in principle, and as far as the physics is concerned, there's absolutely no difference between a biological clock and any other kind of clock. It's only humans that perceive a difference, not nature.I hope this was useful, Bill.