String Theory
A remarkably different situation exists in string theory. Each perturbative description of string theory depends on a string coupling constant. However, in the case of string theory, these coupling constants are not pre-determined, adjustable, or universal parameters; rather they are dynamical scalar fields that can depend on the position in space and time and whose values are determined dynamically.
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| Feynman diagram |
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Background
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Symmetries
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Equations
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Standard Model
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Incomplete theories
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Scientists
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Read more about this topic: Coupling Constant
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