2003/08/06 by André Gsponer, Andre Gsponer, Gsponer, Andre · 2 citations
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Classical Physics (physics.class-ph) #FOS: Physical sciences #physics.class-ph
paper · pdf · doi:10.48550/arxiv.physics/0308027
Submitted to Am. J. Phys., 6 pages
openalex publication_date 2003/08/06 · arxiv created 2003/09/10 · arxiv updated 2009/12/01 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28
This is a late answer to question #79 by R.I. Khrapko, "Does plane wave not carry a spin?," Am. J. Phys. /69/, 405 (2001), and a complement (on gauge invariance, massive spin 1 and 1/2, and massless spin 2 fields) to the paper by H.C. Ohanian, "What is spin?," Am. J. Phys. /54/, 500--505 (1985). In particular, it is confirmed that "spin" is a classical quantity which can be calculated for any field using its definition, namely that it is just the non-local part of the conserved angular momentum. This leads to explicit expressions which are bilinear in the fields and which agree with their standard "quantum" counterparts.