Linnemann, Niels and Read, James
(2021)
Miracles persist: a reply to Sus.
[Preprint]
Abstract
In a recent article in this journal, Sus purports to account for what have been identified as the `two miracles' of general relativity---that (1) the local symmetries of all dynamical equations for matter fields coincide, and (2) the symmetries of the dynamical equations governing matter fields coincide locally with the symmetries of the metric field---by application of the familiar result that every symmetry of the action is also a symmetry of the resulting equations of motion. In this reply, we argue that, while otherwise exemplary in its clarity, Sus' paper fails in this regard, for it rests upon a illegitimate application of the aforementioned result. Thus, we conclude, pace Sus, that these two miracles persist in general relativity.
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