On Wed, Jan 9, 2019 at 5:01 PM Bruce Kellett <[email protected]> wrote:
*> Rubbish. The fine structure constant is not computable by Feynman > diagrams. What might be confusing you is that QED calculations of > physically measurable things like the Lamb Shift and g-2 for the electron > depend on the value of the FSC.* > How is using Feynman diagrams to compute the Lamb Shift Shift (which depends on the Fine Structure Constant) different from using Feynman diagrams to compute the Fine Structure Constant? After all physics didn't determine the Lamb Shift from the Fine Structure Constant, they determined the Fine Structure Constant by looking at the Lamb Shift, in fact the very very fine lines in the spectrum of Hydrogen is how the Fine Structure Constant got its name. The following 2012 article in Physical Review letters describes a QED calculation involving 12,672 tenth order Feynman diagrams used to calculate both the magnetic moment of the electron and the inverse of the Fine Structure Constant and obtaining a value of 137.035999173 which is almost exactly the same as the experimentally derived value: Improved Value of the Fine Structure Constant <https://arxiv.org/abs/1205.5368> John K Clark > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
