Lorentz symmetry is at the core of modern physics: the kinematical laws of special relativity and Maxwell’s field equations in the theory of electromagnetism respect it. The direct relativistic extension of the Schrödinger equation leads to the Klein–Gordon equation, which will be interpreted in the context of the second quantization, to describe bosons. In the Standard Model all interactions are induced by intermediate vector gauge boson fields and the Higgs boson is represented by a scalar boson field.
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