On Wed, Jan 9, 2019 at 5:01 PM Bruce Kellett <bhkellet...@gmail.com> 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

John K Clark


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