String theory is a metaphysical theory
Do we see theoretical physics as metaphysical theories?
In the first half of the 20th century, a group of philosophers called the Vienna Circle discussed the question: How can a boundary be drawn between science and metaphysics?
At the suggestion of their discussion, but in contrast to their findings, the Austrian philosopher Karl Popper established the following delimitation criterion:
The difference between scientific and metaphysical statements is that the former can be forged, but the latter cannot.
For Popper's thesis see his book "The Logic of Scientific Discovery".
Popper's thesis is consistent with the fact that scientific theories like the theory of relativity and the Quantum theory can be falsified by observation. So far these theories have not been falsified, there are no observations that contradict these theories. But we can identify the scope there.
On the other hand, there is no scientific theory that supports the Big Bang as an event. Big Bang is a limit of the Standard Cosmological Model. The Big Bang is not part of the theory, however, as several physical quantities become infinite when they approach the Big Bang backwards in time. However, there is some scientific speculation about how the Big Bang can be embedded in a cyclical cosmological model.
The status of the String theory is controversial. It is unclear whether string theory makes observable predictions at all. The question is whether string theory is metaphysics or science. In either case, string theory relies on an interesting mathematical theory.
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