I’m asking this because there is a scifi book I’m reading, and in the book there’s a scene where someone is communicating with a person in a spacecraft moving at lightspeed. I know their ability to communicate would probably not be possible, but let’s just put that aside for a second. Hypothetically, if you could communicate with someone moving lightspeed, would the time dilation make it so that they would appear to be moving and speaking very slowly relative to you?

  • givesomefucks@lemmy.worldEnglish
    2·
    3 days ago

    Though I know in real life that wouldn’t be possible because entanglement still can’t be used to transmit information faster than light.

    The entire point of it, is that it can…

    How does that work?

    It’s still entangled…

    Everything about the two still has to be exactly the same, even adjusted for time dilation.

    So if one is experiencing 10x the speed, 1 second of its “input” takes 10 seconds on the slow side to “output”. The 1/10th speed replies and 1 second there is “output” as 10 seconds, just like it’s relatively spinning 10x the speed as the reference particle.

    Again, technically hypothetical because we can’t build anything like that yet to actually see if it wouldnhappen. It’s just one of those things where it just has to work out like that logically even though we can’t see it.

    • a_gee_dizzle@lemmy.caOPEnglish
      2·
      3 days ago

      Though I know in real life that wouldn’t be possible because entanglement still can’t be used to transmit information faster than light.

      The entire point of it, is that it can…

      Intuitively it seems like it should, but apparently that doesn’t work.

      So if one is experiencing 10x the speed, 1 second of its “input” takes 10 seconds on the slow side to “output”. The 1/10th speed replies and 1 second there is “output” as 10 seconds, just like it’s relatively spinning 10x the speed as the reference particle.

      Ah okay I see what you mean. So I guess, for one participant in the conversation would seem like they were talking very slowly, and the other would seem to be talking very fast. But they could still be in sync, they would just perceive the time differently

      • givesomefucks@lemmy.worldEnglish
        1·
        3 days ago

        From the link:

        Though scientists still debate how the seemingly bizarre phenomenon of entanglement arises, they know it is a real principle that passes test after test. In fact, while Einstein famously described entanglement as “spooky action at a distance,” today’s quantum scientists say there is nothing spooky about it.

        “It may be tempting to think that the particles are somehow communicating with each other across these great distances, but that is not the case,” says Thomas Vidick, a professor of computing and mathematical sciences at Caltech. “There can be correlation without communication,” and the particles “can be thought of as one object.”

        I mean…

        The alternative to them communicating but still somehow staying in sync…

        Is that they have to be the same particle, that’s the alternative.

        That the one electron theory isnt just real, it works on subatomic particles sometimes which in this context is orders of magnitude large…

        You think that simplifies but it makes it way crazier.

        for one participant in the conversation would seem like they were talking very slowly, and the other would seem to be talking very fast.

        The exact opposite…

        I don’t know how to put it any simpler.

        Think of it as writing text on a string of ticker tape. The wider the tape, the bigger text, the faster the tape comes out by inches of length.

        To relay the same info on a skinner piece of ticker tap, the text shrinks, and the tape comes out slower by length.

        Regardless of the size of the text, or the speed the tape, the information is coming out at the same speed consistent speed.

        But like,instead of a ticket tape, think of it as x seconds of speech.