Abstract
Using the usual matrix representation of Clifford algebra of spacetime, quantities independent of the choice of a representation in the Dirac theory are examined, relativistic invariance of the theory is discussed, and a nonlinear equation is proposed. The equation presents no negative energy waves and gives the same results as the linear theory for hydrogen atom.
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Daviau, C. Linear and nonlinear Dirac equation. Found Phys 23, 1431–1443 (1993). https://doi.org/10.1007/BF01243940
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DOI: https://doi.org/10.1007/BF01243940