How do photons experience time?
Ethan Siegel
15716

These explanations about relativity are always still just that troubling, aren’t they, to nag away at feeling no, it doesn’t quite explain it all, and no, either you still can’t quite understand it or there is still something wrong with it. So I walk to the store and my watch is a couple of nanoseconds different from the storekeeper’s. And I walk back and my watch is another couple of nanoseconds different. So what was that shared “now” when I was actually at the store talking to the storekeeper? We weren’t on different timelines then, with a (too small to be detectable) gap in communications, like waiting for a signal to be bounced off the moon. So our subjective passages of time, being different, must surely be different from the time represented by the now-moment when we are together, however fast or long one of us must have been travelling to get there. There seems to be some kind of indication of a “real” or “objective” flow of time here, as well as fluctuating “subjective” times. No, I have no qualifications in either physics or philosophy, but neither did Socrates or Jesus — they could still think about things!

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