scholarly journals On the group-theoretical approach to relativistic wave equations for arbitrary spin

2021 ◽  
Vol 209 (2) ◽  
pp. 1507-1522
Author(s):  
L. Nanni
Keyword(s):  
Theoretical Approach ◽  
Wave Equations ◽  
Arbitrary Spin ◽  
Relativistic Wave Equations ◽  
Relativistic Wave

scholarly journals On relativistic wave equations for particles of arbitrary spin in an electromagnetic field

1939 ◽  
Vol 173 (953) ◽  
pp. 211-232 ◽  
Keyword(s):  
Electromagnetic Field ◽  
Wave Equations ◽  
Energy Momentum Tensor ◽  
External Electromagnetic Field ◽  
Arbitrary Spin ◽  
Momentum Tensor ◽  
Relativistic Wave Equations ◽  
Relativistic Wave ◽  
Second Quantization ◽  
Set Up

The investigations of Dirac (1936) on relativistic wave equations for particles with arbitrary spin have recently been followed up by one of us (Fierz, 1939, referred to as (A)) It was there found possible to set up a scheme of second quantization in the absence of an external field, and to derive expressions for the current vector and the energy-momentum tensor. These considerations will be extended in the present paper to the case when there is an external electromagnetic field, but we shall in the first instance disregard the second quantization and confine ourselves to a c -number theory. The difficulty of this problem is illustrated by the fact that the most immediate method of taking into account the effect of the electromagnetic field, proposed by Dirac (1936), leads to inconsistent equations as soon as the spin is greater than 1.

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