Recent content by SpookyMulder

Ah, thank you, that's helpful! However, I still get a crazy matrix after multiplying ##L^{-1}(\Lambda p)\Lambda L(p)## together. How do I extract the angle that depends on both ##\Lambda## and ##p## in a complicated way? In the paper you suggested they derive a general form of a product of two...

Summary: Suppose that observer ##\mathcal{O}## sees a ##W## boson (spin-1 and ##m > 0##) with momentum ##\boldsymbol{p}## in the ##y##-direction and spin ##z##-component ##\sigma##. A second observer ##\mathcal{O'}## moves relative to the first with velocity ##\boldsymbol{v}## in the...

No, we are not talking about pure vacuum subdiagrams here, but disconnected diagrams that have external legs. I thank Avodyne once again for answering my question.

Avodyne, thanks for your reply. Now it's more clear. Can you think of any other books where this topic is explained better than in Schwartz's book? OK, if we go back to the problem that Schwartz assigned, am I supposed to prove that \left|\mathcal{M}_{disc}+\mathcal{M}_{conn}\right|^2 =...

One more thing. Is there a book other than Weinberg's that carefully explains these things? Don't get me wrong, I love Weinberg's books, but sometimes you need a less advanced book to understand what Weinberg says and I've never seen anyone except for Schwartz who would talk about cluster...

Hi, I'm reading Schwartz's book "Quantum field theory and the standard model", section 7.3.2., page 95 (https://books.google.com/books?id=HbdEAgAAQBAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false) where he's talking about disconnected diagrams, the ones that have subsets...