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 -- 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to firstname.lastname@example.org. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.