Friday, June 15, 2012

1206.3074 (Paweł Caban et al.)

Relativistic spin operator and Dirac equation    [PDF]

Paweł Caban, Jakub Rembieliński, Marta Włodarczyk
We give a direct link between description of Dirac particles in the abstract framework of unitary representation of the Poincar\'e group and description with the help of the Dirac equation. In this context we discuss in detail the spin operator for a relativistic Dirac particle. We show also that the spin operator used in quantum field theory for spin $s=1/2$ corresponds to the Foldy-Woutheysen mean-spin operator.
View original: http://arxiv.org/abs/1206.3074

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