Testability and Experimental Predictions
| Is there a string theory vacuum that exactly describes everything in our universe? Is it uniquely determined by low energy data? |
Several major difficulties complicate efforts to test string theory. The most significant is the extremely small size of the Planck length, which is expected to be close to the string length (the characteristic size of a string, where strings become easily distinguishable from particles). Another issue is the huge number of metastable vacua of string theory, which might be sufficiently diverse to accommodate almost any phenomena we might observe at lower energies.
Read more about this topic: String Theory
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