Answer to December 2018 Figuring Physics

Cover vol. 15, no. 6, December 2018

Physics 215 B QFT Winter 2018 Assignment

(a) Consider scattering of an electron (e−) and a positron (e) into e−e+ (so a = b in the notation above). We wish to consider the contribution to the imaginary part of the amplitude for this process which is proportional to QeQ 2 μ where Qe and Qμ are the electric charges of the electron and muon (which are in fact numerically equal but never mind that). Draw the relevant Feynman diagram, and ...

Physics 215 B QFT Winter 2018

Does Physics Answer Metaphysical Questions?

According to logical positivism, so the story goes, metaphysical questions are meaningless, since they do not admit of empirical confirmation or refutation. However, the logical positivists did not in fact reject as meaningless all questions about for example, the structure of space and time. Rather, key figures such as Reichenbach and Schlick believed that scientific theories often presupposed...

Persian-translation vol. 15, no. 6, December 2018