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Required fields*

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    $\begingroup$ I'm sorry, I know nothing about string theory. I'll wait for someone else to accept the challenge $\endgroup$ Commented Aug 28, 2021 at 20:25
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    $\begingroup$ see this post and links therein physics.stackexchange.com/questions/30005/… $\endgroup$ Commented Aug 28, 2021 at 20:29
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    $\begingroup$ @SamCottle It has nothing to do with electromagnetism. Perturbative string theory automatically has massless spin-2 particles, and any reasonable theory with interacting massless spin-2 particles has gravity. For a nonperturbative perspective, the AdS/CFT correspondence is the most-studied framework so far. (That's not an answer, just a couple of sentences with keywords to point you in the right direction, because I don't think a one-post answer is feasible.) $\endgroup$ Commented Aug 28, 2021 at 20:57
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    $\begingroup$ What you might've read is that string theorists make use of dimensional reduction which was originally formalized as part of a different theory by Kaluza and Klein which attempted to unify gravitational and electromagnetic fields back when people thought these were the only two forces. $\endgroup$ Commented Aug 28, 2021 at 20:59
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    $\begingroup$ @ChiralAnomaly even more basic the (assumed) vanishing of the beta functions imply Einstein Field equation (for vacuum) $\endgroup$ Commented Aug 28, 2021 at 21:36