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[Moderator's note: This thread is spun off from another thread since it was dealing with a more technical point that is out of scope for the previous thread. The quote that starts this post is from the previous thread.]
I feel the same about transformations of Dirac matrices and Dirac field under space-time coordinate transformations. Most QFT textbooks use pedagogy according to which field transforms and matrices don't, while in GR only the reverse pedagogy makes sense. So I propose to use the reverse pedagogy in SR too: https://arxiv.org/abs/1309.7070vanhees71 said:In GR it's not conceivable to me, how to make sense of a relativistic mass at all. You can make some sense of this idea in SR, but why should one?
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