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I Fundamental equation in string theory

  1. Nov 18, 2018 #1
    Is there a fundamental equation in string theory and can it be derived from a variational principle?
     
  2. jcsd
  3. Nov 19, 2018 #2

    Demystifier

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    If you mean an equation from which all properties of string theory can, in principle, be deductively derived, then such an equation is not yet known.
     
  4. Nov 20, 2018 #3

    haushofer

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    If there is "a" fundamental equation at all in string theory, I guess you're looking for the Polyakov action,

    https://en.wikipedia.org/wiki/Polyakov_action

    This is basically a rewritten Nambu-Goto action such that quantization becomes easier. For the full string theory, you want the supersymmetrization of this Polyakov-action.
     
  5. Nov 21, 2018 #4

    Demystifier

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    The Polyakov action (or its supersymmetric generalization) is fundamental for perturbative string theory, but it is not sufficient to understand the non-perturbative aspects.
     
  6. Nov 22, 2018 #5

    Urs Schreiber

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    This is an FAQ: see What are the equations of string theory?
     
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