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If your model predicts Tachyons is that bad?

  1. Jul 13, 2012 #1
    When I first learned about Tachyons I was lead to believe that they meant your model had anomalies and you needed to go back to the drawing board and come up with a new model. But lately I've been hearing that they are not all that bad. I wish I had some direct quotes but I don't. Are tachyons anathema in the physics community? Do they automatically rule your model out if your model predicts them?
     
  2. jcsd
  3. Jul 13, 2012 #2
    They're very bad. Not as much the tachyons themselves, but the fact that a theory with tachyons predicts an unstable vacuum. This was the problem with the early bosonic string theories, which was resolved by including supersymmetry.
     
  4. Jul 13, 2012 #3

    Simon Bridge

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    What Mark said.
    Tachyons, and tachyonic fields are not exactly anathema - the math is kinda a mental exercise for theorists. But them showing up in a model that does not start out by presupposing them basically means the model is junk.

    Presupposing them is basically saying you are deliberately making a junk model - but carefully. You may want to do this to expose possible flaws in the existing physics that may lead to new discoveries.
     
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