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$\begingroup$ How can one be an observer on an accelerated system if there is no energy associated with the acceleration ? $\endgroup$
– anna v
Commented Oct 16, 2017 at 5:04
2

$\begingroup$ @annav I don't feel this sort of pedantry is in any way constructive. 1) The answerer clearly meant that the connection coefficients will not vanish in a nonlinear coordinate system even in curvature-free pseudo-riemannian spaces; 2) Approximation? Or every time you do special relativity, quantum field theory, and classical electrodynamics, you always take the gravitational back-reaction into the calculation? I don't think so. $\endgroup$
– Bence Racskó
Commented Oct 16, 2017 at 7:04

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