Diagrammatica by Veltman is the reason I started studying QFT. This man is highly underestimated ( even here in his own country The Netherlands). It is due to Veltman that the Weinberg's theory made sense and the Standard Model was formulated. He was the only one to realise that the theory of the electroweak was renormalisable through Yang-Mills fields and made his student 't Hooft (yes, his student. Although 't Hooft gets the credit all the time and is a big name in the community, it is really Veltman the supervisor who developed the theory and made his own code program to calculate the seemingly divergent integrals)contribute by helping in solving the equations. Anyway his book is great. His way of explaining is phenomenal. Little comments here and there that big professors can learn from. You can sense how good he understands the subject by making it easy for the reader. No detailed calculations are present, but working out everything you'll get the basic ideas of QFT in big lines. Unlike much theorists, he values common sense and simplicity above vagueness. He was highly skeptical of String theory and never believed in dark matter. His book on quantum gravity is really hard, but could be used after proper understanding of QFT. There he derives the graviton propagator by giving it a small mass (such like the massive photon in Diagrammatica with 3 helicity states)
Why doesn't he believe in dark matter? P.s. I'm a lay person but also skeptical of dark matter, which seems to violate Karl Popper's principles of science. Curious about his view and where to learn more.
@@joshux3210 There are actually some pretty good physicists who don't like the idea of dark matter. I guess it's because there is really no any new "particle" fits exactly with properties of dark matter despite "significant" efforts.
