So since string theory is a quantum gravity theory, how can we derive from string theory to Einstein gravity equation when $\hbar \rightarrow 0$, as what we did from quantum theory to classical theory? Can you elaborate more on this?
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Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. – Community Aug 08 '22 at 10:33
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Also interesting reads: In what limit does string theory reproduce general relativity? and How do Einstein's field equations come out of string theory? – John Rennie Aug 08 '22 at 11:17