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    $\begingroup$ The principle holds for an infinite massive plane. Standing on that plate is like being accelerated in empty space. $\endgroup$ Commented Feb 13, 2022 at 2:15
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    $\begingroup$ @Felicia Please post answers as answers, not as comments $\endgroup$ Commented Feb 13, 2022 at 2:41
  • $\begingroup$ Weinberg's version doesn't seem to require local Lorentz symmetry. It seems to allow for Newtonian gravity and Galileo symmetry as well. Am I missing something? You are, of course, correct. It is also very sloppy with the calculus angle. $\endgroup$ Commented Jun 28, 2024 at 1:09