erturs

erturs

  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    I will try again, once. With what I am talking about, the cause DOES precede the effect, in all frames involved in the causal chain. Inertial frames of reference are coordinate systems. Only events can be "involved in a causal...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    Anyway, what MIGHT be the sticking point is the idea of "clearly and inevitably violates." This is an assumption, based on the notion that one causality violation makes FTL completely and universally impossible. Obviously we're talking past each other, and...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    I have never heard of the first being referred to as causality; yes, it obviously breaks that, The idea that cause must precede effect is hardly original to me :). but it should say "the cause APPARENTLY comes after the...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    Firstly, SPECIAL relativity IS inevitable given Newtonian mechanics and the observed fact that the speed of light is constant in all frames. There is no other solution but the Lorentz transformations. I wasn't wrong. I said that the (Galilean) principle...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    Again, you're wrong. Consider a beam of light going from A to B, and bouncing, and returning to A. Simply by doing that... they are in the same frame of reference. In relativity a "frame of reference" is a set...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    Probably expect a US-Chinese codominion like Pournelle's US/USSR alliance, with the US and China both deciding authoritarian capitalism is the way to go. I can imagine the US/China deciding to use propaganda calling the commonwealth racist/antisemitic for not letting blackrock/the...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    And I guess before this spirals out of control again: you can have both FTL and causality, you just have to give up on relativity. And that's fine! The principle of relativity is not logically inevitable. But if you're writing...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    Consider A and B, both moving slower than light. A fires up their ansible, and sends a message to B. B gets it... inside the light cone. B now responds with their ansible.. and A receives it, again inside the...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    That is NOT a proof of a causality breach; I did slightly more thorough calculations and convinced myself that it couldn't be made into one. Yes, without an exclusion principle (i.e. that two frames cannot both use FTL if they...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    Speaking of the Hanovers, I wonder what will become of Liz Hanover. She seems like a natural policitian, and IIRC even asked whether she would be allowed to participate in politics and was assured she would be. But in practice...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    All distances and times are as measured by the slower than light observers (that's what the "as measured in an inertial frame whose endpoints are at rest" means). How the warp drive works doesn't matter, unless it permanently alters the...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    I am pretty sure that the paradox arises only if the messages are fast enough, where that depends on the relative speeds of the observers. True, but for any FTL message speed there's a slower than light observer speed that...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    I'd suggest stepping carefully on this one. I'm not a physicist, obviously. However, the problem with warp drives is that they're not exactly FTL. They change distances until the distance can be traveled STL. No. The paradox arises if strictly...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    I have no idea how you turn an Alcubierre warp into a time machine... You do that by pairing it with a slower than light drive. To make a closed timelike curve (aka Grandfather paradox) with any FTL mechanism whatsoever,...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    > However, I wish someone like you who's more mathematical than I am could tackle the craziness of time being half quantum entropy, half relativistic dimension. That's worse than half man half biscuit, at least when I think about it....
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    > Inter alia, in evolution, there has to be some definite advantage for the change at every stage. It is NOT enough for there to be a definite advantage towards the end point. Actually mutations are random, and neutral mutations...
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    Ah, thank you dmd! I had missed that Miriam used the rank earlier, while Rita was still present....
  • Commented on Empire Games (and Merchant Princes): the inevitable spoiler thread!
    Just finished and very much enjoyed the book! No doubt too late to fix, but there are a few continuity errors. When Kurt first meets Miriam and they're talking, there's a passage "A cold flush of sweat chilled the small...
  • Commented on So you think you can be a reality TV producer
    Guilty as charged, Heteromeles (and Moz): I am a mathematician, and I do sometimes come across too strongly for relativity. There is always a a little bit of wiggle room, and there is always more that we have to learn...
  • Commented on A serious question
    Lycanthropy transformations are triggered by a particular geometry of spacetime involving massive bodies tracing circles about one another. The light is a symptom, not a cause -- photons trace null geodesics -- so blocking it doesn't help. If the gravity...
  • Commented on So you think you can be a reality TV producer
    OK, I'm having no luck with temporal arguments it seems. How about a spatial argument: there must be some upper limit to how fast you can get from point A to point B. Otherwise, you could continually flit between A...
  • Commented on So you think you can be a reality TV producer
    Sorry Charlie, for hijacking this thread... the FTL questions have been really interesting and have made me think long and hard about my view of relativity. But if you give me a yellow card I will absolutely accept that I've...
  • Commented on A serious question
    Could lycanthropy be a tidal effect of some kind? It does depend on the relative positions of sun, Earth, and Moon....
  • Commented on So you think you can be a reality TV producer
    Another way to think of it is that to do an experiment someone has to do the measurement. The person doing the measurement has their own coordinate system from the moving twins. For consistent results the math has to work...
  • Commented on So you think you can be a reality TV producer
    I have bad news for you: I just realized how you can positively prove who was moving close to the speed of light and who wasn't: Heinlein's Time for the Srats, where one twin goes on the starship, and the...
  • Commented on So you think you can be a reality TV producer
    Re: wormholes. To carefully analyze any wormhole communication, we do have to remember that any real system involves parts of real space. That is, to get from planet A to planet B via wormhole you have to get from A...
  • Commented on So you think you can be a reality TV producer
    Thanks everyone for the FTL discussion, and I'm sorry about all the walls of text. Even those who disagreed with me pointed out very good ways of looking at the problem and have helped me to clarify my understanding. E.g....
  • Commented on So you think you can be a reality TV producer
    I may be rehashing material you've all seen before, but I found this line of thinking interesting: (1) Either there is a limit to how quickly you can send messages, or there isn't. If there isn't, you can communicate instantly...
  • Commented on So you think you can be a reality TV producer
    I wish "the speed of light" in relativity texts could be renamed to "the speed of gravity". It might make some things a bit more intuitive. In a hand-wavy and plausible sounding way (but probably wrong in the details): (1)...
  • Commented on So you think you can be a reality TV producer
    D. Mark Key@1493: @erturs 1472: Thank you for the clarification, but that wasn't the question I was asking. I'm taking a crack at the restriction that prevents Bob from replying to Alice that you outlined in 1289. Ah, I see....
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