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1 year ago in Physics By Kumar

Does the fine-structure constant have any known direct influence on the theory of gravitation?

The fine-structure constant α appears everywhere in QED and atomic physics. I'm delving into unification theories and see numbers like the gravitational coupling constant being discussed. Is there any established theoretical framework where α directly influences or couples with gravity, or is any connection purely speculative at this point? I'm trying to separate established physics from intriguing conjecture.

 

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By Prajwal Sharma Answered 1 year ago

This touches on one of the great mysteries in fundamental physics. In our current, established theories General Relativity and the Standard Model the fine-structure constant (α) and gravity (described by G or the Planck mass) are completely independent; α governs electromagnetic strength, full stop. However, in the realm of speculative unification theories (like string theory or some approaches to quantum gravity), finding a formula that derives α from more basic principles, potentially linking it to gravitational parameters, is a holy grail. I have seen many intriguing numerical coincidences discussed, but no such derivation is experimentally verified or universally accepted. Any direct influence remains a profound open question.

 

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