On Thu, Jan 10, 2019 at 11:38 AM John Clark <johnkcl...@gmail.com> wrote:

> 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:

That is an experimentally derived value!!!!!

> Improved Value of the Fine Structure Constant
> <https://arxiv.org/abs/1205.5368>
> John K Clark

Your original claim was that the fine structure constant was computable.
But it is not computable from first principles, it is a physical constant
that must be measured. The fact that computations might be involved in
getting the value from measurements does not mean that the FSC is itself

You have to define what you mean by "computable". The FSC is a measured
quantity, not computable in the way pi or e are computable from
mathematical formulae.


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