Abstract
The basic idea of this chapter is that we get the correct equations of nature, by minimizing something. What could this something be? One thing is for sure: the object shouldn’t change under Lorentz transformations, because otherwise we get different laws of nature for different frames of reference. In mathematical terms this means the object we are searching for must be a scalar, which is an object transforming according to the (0, 0) representation of the Lorentz group. Together with the restriction to the simplest possible choice this will be enough to derive the correct equations of nature. Nature likes it simple.
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Schwichtenberg, J. (2018). The Framework. In: Physics from Symmetry. Undergraduate Lecture Notes in Physics. Springer, Cham. https://doi.org/10.1007/978-3-319-66631-0_4
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DOI: https://doi.org/10.1007/978-3-319-66631-0_4
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