When quantum physics is made consistent with relativity (as first done by Dirac

Question

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 in- cluded 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 an antiparticle that has the same physical properties but op- posite charge.

2. The potential energy in the equation becomes much more complicated because it must have at least one part that is spin- dependent.

3. The fermion mass cannot be constant, but must vary as the included potential energy varies.

4. The fermion must have a spin.

Explanation / Answer

Ans. Option 2 is incorrect. this was not the demand.

Dirac equation was required as the quantum systems got studied at relativistic speeds.

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