erturs

erturs

  • 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....
  • Commented on So you think you can be a reality TV producer
    #1441 - You've just made the same mistake as Erturs; assuming that we will accept "proof by assertion" that Time can flop signs when you want it to, when there is no evidence (not even from time dilation experiments) that...
  • Commented on So you think you can be a reality TV producer
    D. Mark Key@1465: I already assumed that Alice could not send messages which would be received with "Alice times" that were earlier than the send time. If she could, she would have no need of Bob to relay messages back...
  • Commented on So you think you can be a reality TV producer
    Heteromeles@1463: Thanks. I have to agree with you that SF writers tend to forget to account for how the species gets from "there" to "here". I've seen lots of aliens that seem to have built to "look cool", and which...
  • Commented on So you think you can be a reality TV producer
    My understanding is that the warpship is at rest inside the warp bubble, and the warp bubble itself is moving relative to the outside. Fair enough, merely turning on the warp drive may not be sufficient to establish your original...
  • Commented on So you think you can be a reality TV producer
    Finally (and yeah, I am too excitable about this, sorry!) if you say "Alice is moving at .9c", if relativity is true you have to say ".9c relative to X". So when we say "Alice is moving at .9c away...
  • Commented on So you think you can be a reality TV producer
    Ah, sorry. I'm getting excitable about this and making horrible typos: my apologies. Where I'm coming from is that I really want FTL travel to be possible. I also really like the elegance and symmetry of the principle of relativity....
  • Commented on So you think you can be a reality TV producer
    Sorry, but by that logic, radio messages cause time paradoxes, since Alice, by her clock, at .9c says that at time=t, she sends Bob a message. Bob, at .2c, gets it, but the message says it was sent before he...
  • Commented on So you think you can be a reality TV producer
    Maybe I've had the "aha" moment about why we're talking past each other. People keep talking about warpships going "100c". 100c relative to what? If your warpships have a maximum velocity of 100c relative to Earth's rest frame, *regardless of...
  • Commented on So you think you can be a reality TV producer
    Stop hand waving, read the literature, light at least one fire, and figure out how something that's radically nonhuman in shape can make all four of these, can transfer a coal to tinder, and can blow it alight. It's not...
  • Commented on So you think you can be a reality TV producer
    Just to re-iterate: I have been talking about Alice and Bob in spaceships, but I've always been talking about *strictly slower than light spaceships* in my discussion. Alice is STL (always), and Bob is STL (always). They use a courier...
  • Commented on So you think you can be a reality TV producer
    For one, you continually utterly ignore going *outside* "normal space", aka this space-time, where GR and SR are valid. Yes, I ignore it. You seem to be missing my point that I only talk about the clocks of Alice (on...
  • Commented on So you think you can be a reality TV producer
    paws4thot@1400: Thanks for your message and the geometrical insights; I think your analysis is slightly off (spacetime is not Euclidean, so coordinate systems act in unexpected ways) but it does gives a nice way of looking at things which I'll...
  • Commented on So you think you can be a reality TV producer
    FTL using a suitable exclusion principle is compatible (*) - the eschaton alone knows how that would work, but still .... That's a really interesting idea, and I think it could work (it would be a kind of spontaneous symmetry...
  • Commented on So you think you can be a reality TV producer
    There's also the ASSUMPTION that FTL messaging is instentaneous - suppose it isn't, suppose it's say 100c or 1000c .... plenty of wriggle-room in there, certainly for SF writers. Unfortunately while there is a "speed of paradox" below which messages...
  • Commented on So you think you can be a reality TV producer
    Toby @1393: OK, sorry, I was far too flip. I should have replied more carefully. Here's your original message: The other is,if Alice gets in her spaceship 12.00 and accelerates such that time dilation causes shipboard time to run at...
  • Commented on So you think you can be a reality TV producer
    whitroth @ 1376: When an FTL message is sent, it spirals around OUTSIDE the light cone, but still in the same positive direction in time. Outside whose light cone? And when it re-enters spacetime, "in the same positive direction in...
  • Commented on So you think you can be a reality TV producer
    Maybe I'll try one more time: if the FTL message is *OUTSIDE* STL space, than try to picture this: Bob and Alice both left Earth. The light cone extends towards each of them. When an FTL message is sent, it...
  • Commented on So you think you can be a reality TV producer
    The other is,if Alice gets in her spaceship 12.00 and accelerates such that time dilation causes shipboard time to run at half the speed of her departure location. Bob then sends an FTL message at 13.00 his time, this will...
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