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it seems so far there is no "justification" of these Feynman rules?!
Where does the vertex factor and the propagators come from?
They come from interaction lagrangian
@@30indrayudhdas28*more precisely the lagrangian density
why don't we consider all feynman diagram in the calculus why don't we go above some order ? is it link to the fine-structure constant
Because there are infinitly many
it seems so far there is no "justification" of these Feynman rules?!
Where does the vertex factor and the propagators come from?
They come from interaction lagrangian
@@30indrayudhdas28*more precisely the lagrangian density
why don't we consider all feynman diagram in the calculus why don't we go above some order ? is it link to the fine-structure constant
Because there are infinitly many