Comment on Light-Speed Spaceships Would Have Trouble Phoning Home

seaQueue@lemmy.world ⁨6⁩ ⁨months⁩ ago

• xkforce@lemmy.world ⁨6⁩ ⁨months⁩ ago

  Gravity travels at c. The Alcubierre drive tried to use bubbles in spacetime to “bend the rules” in order to result in apparent >c velocities but recent simulations indicate the bubble becomes unstable when attempting to exceed c.

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  • AngryCommieKender@lemmy.world ⁨6⁩ ⁨months⁩ ago

    Then we need the Tim (Allen) Taylor solution.

    Moar Power! Uhh uhh uhh uhh uhh

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• KISSmyOS@lemmy.world ⁨6⁩ ⁨months⁩ ago

  Quantum entanglement is like ripping a photo in half, putting both halves in seperate envelopes and carrying them to opposite ends of the world.
  As soon as you open your envelope, you instantly know which half of the photo is on the other side of the planet - Faster Than Light Information Transfer!

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  • xkforce@lemmy.world ⁨6⁩ ⁨months⁩ ago

    For a variety of reasons, no information is actually transfered. Quantum entanglement can not be used to get around the limits imposed by relativity.

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    • KISSmyOS@lemmy.world ⁨6⁩ ⁨months⁩ ago

      That’s what I was trying to illustrate.

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      • intensely_human@lemm.ee ⁨6⁩ ⁨months⁩ ago

        Illustrate?? I thought you were talking about photographs

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  • luthis@lemmy.nz ⁨6⁩ ⁨months⁩ ago

    This is a great analogy. Consider it stolen.

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  • INeedMana@lemmy.world ⁨6⁩ ⁨months⁩ ago

    So it’s not like: when I affect the hue (some attribute) of my half, the other half will change too? That has always been my understanding of it

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    • SpacetimeMachine@lemmy.world ⁨6⁩ ⁨months⁩ ago

      No, measuring one particle collapses the entanglement and they no longer affect each other. It is a one time thing. You can’t modify them after they have been observed.

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      • intensely_human@lemm.ee ⁨6⁩ ⁨months⁩ ago

        So at best it can be used for unpredictable coordination between vastly-spaced armies.

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• SpacetimeMachine@lemmy.world ⁨6⁩ ⁨months⁩ ago

  C is more than just the speed of light. It is the speed of Causality. No information can travel faster than C in a vacuum. Gravitational waves already reach us faster than the light from events that cause them (i.e. neutron star collisions) Because small particles slow down the light over long distances, as they absorb and then re-emit the photons.

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• SkaveRat@discuss.tchncs.de ⁨6⁩ ⁨months⁩ ago

  The problem with information traveling ftl is, that you’re very quickly running into paradoxes. So just by logic wanting to keep intact, I feel like ftl communication will be impossible

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  • bluGill@kbin.social ⁨6⁩ ⁨months⁩ ago

    Logically it makes sense, but the real world is years and often we don't use the right logical systems. It makes logical sense to most people that a heavy object falls faster then a light object ,but we know that is false (and a also a non obvious logical system that also shows it is false)

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  • justJanne@startrek.website ⁨6⁩ ⁨months⁩ ago

    If you actually calculate the maximum speed at which information can travel before causing paradoxes, in some situations it could safely exceed c.

    For two observers who are not in motion relative to each other, information could be transmitted instantly, regardless of the distance, without causing a paradox.

    The faster the observers are traveling relatively to each other, the slower information would have to travel to avoid causing paradoxes.

    More interestingly, this maximum paradox-free speed correlates with the time and space dilation caused by the observers’ motion.

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• Jamie@jamie.moe ⁨6⁩ ⁨months⁩ ago

  By the time we invent any sort of lightspeed travel, we’ll have long conquered quantum entanglement. If you have a signal transferred over a properly quantum entangled technology, the signal would transfer instantaneously.

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  • AngryCommieKender@lemmy.world ⁨6⁩ ⁨months⁩ ago

    Another option would be tiny temporary Einstein Rosen bridges. Sure the energy requirements would be hideous, but if we’ve figured out how to exceed C, I don’t think we really care about energy costs anymore.

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  • mypasswordistaco@iusearchlinux.fyi ⁨6⁩ ⁨months⁩ ago

    You cannot transmit information through entangled particles, so probably not.

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• XeroxCool@lemmy.world ⁨6⁩ ⁨months⁩ ago

  Oh, you already know about it. No one else should bother reading then.

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