Representation of Physical Reality
In their presentations of fundamental interactions, written from the particle physics perspective, Gerard ’t Hooft and Martinus Veltman gave good arguments for taking the original, non-regularized Feynman diagrams as the most succinct representation of our present knowledge about the physics of quantum scattering of fundamental particles. Their motivations are consistent with the convictions of James Daniel Bjorken and Sidney Drell: ”The Feynman graphs and rules of calculation summarize quantum field theory in a form in close contact with the experimental numbers one wants to understand. Although the statement of the theory in terms of graphs may imply perturbation theory, use of graphical methods in the many-body problem shows that this formalism is flexible enough to deal with phenomena of nonperturbative characters ... Some modification of the Feynman rules of calculation may well outlive the elaborate mathematical structure of local canonical quantum field theory ...” So far there are no opposing opinions. In quantum field theories the Feynman diagrams are obtained from Lagrangian by Feynman Rules.
Read more about this topic: Feynman Diagram
Famous quotes containing the words representation of, physical and/or reality:
“The pleasure we derive from the representation of the present is due, not only to the beauty it can be clothed in, but also to its essential quality of being the present.”
—Charles Baudelaire (1821–1867)
“But alas! I never could keep a promise. I do not blame myself for this weakness, because the fault must lie in my physical organization. It is likely that such a very liberal amount of space was given to the organ which enables me to make promises, that the organ which should enable me to keep them was crowded out. But I grieve not. I like no half-way things. I had rather have one faculty nobly developed than two faculties of mere ordinary capacity.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)
“There is a moment when nothing can be wiped out and left behind any more, when there is only reality—and reality is horrifying.”
—Friedrich Dürrenmatt (1921–1990)