On Thu, Jan 10, 2019 at 8:18 PM Brent Meeker <meeke...@verizon.net> wrote:

* > The fine structure constant is e^2/hbar*c.  Those three values are
> measured independent of any Feynman diagrams*

Absolutely correct. So if you use Feynman diagrams to predict what some
physical system is going to do, such as a physical system of 2 electrons
being hit by a photon of light with a wavelength small enough to contain
enough energy to prevent the electrons repulsion, then you'd better get a
number very close to the Fine Structure Constant. If you don't then Feynman
Diagrams aren't any good.

They didn't use 12,672 Feynman Diagrams because they wanted to know what
the Fine Structure Constant was, they already knew what that number was to
many decimal places from exparament, they used 12,672 Feynman Diagrams
because they wanted to see if Feynman Diagrams worked. And it turned out
they worked spectacularly well in that situation, and that gives scientists
great confidence they can use Feynman Diagrams in other situations to
calculate what other physical systems will do that involve the
Electromagnetic Force.

I asked this question twice before but have still not received an answer, if
checking a theoretical prediction against a measured value is not the way
to tell the difference between a good physical theory and a bad one what on
earth is?

John K Clark

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