Hi. In GR , covariant differentiation is used because the basis vectors are not constant. But , what about in SR ? If the basis vectors are not Cartesian then they are not constant. Does covariant differentiation exist in SR ? And are for example spherical polar basis vectors which are not constant treated differently to Cartesian basis vectors in SR ?(adsbygoogle = window.adsbygoogle || []).push({});

Another question I have is regarding Lorentz Scalar Fields. I have read that a wave can be treated as a Lorentz scalar field which means that its amplitude in one frame is the same as measured in any other inertial frame but why is the wave amplitude not Lorentz contracted ?

Thanks

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# Basis vectors in SR and Lorentz scalar fields

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