When quantum physics is made consistent with relativity (as first done by Dirac in 1927) a number of remarkable physical features of fermions turn out to be automatically included by the requirement of covariance (that is, that the equation have the same form in all inertial frames).
When quantum physics is made consistent with relativity (as first
done by Dirac in 1927) a number of remarkable physical features of fermions turn out to be automatically included by the requirement of covariance (that is, that the equation have the same form in all inertial frames). Which one of the properties of fermions listed below is NOT demanded by covariance?
1. The fermion must have a spin.
2. The fermion mass cannot be constant, but must vary as the included potential energy varies.
3. The fermion must have an antiparticle that has the same physical properties but opposite charge.
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