- #51

A. Neumaier

Science Advisor

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How is Lorentz invariance handled in GR? [...] does GR imply small Lorentz violations in practice?

No. Lorentz invariance is independent of general covariance = diffeomorphism invariance. The latter only replaces the translation invariance of flat field theories.

Lorentz invariance is seen explicitly in general relativity coupled to a spinor field, where gravity is represented by a frame field and local Lorentz invariance is imposed on the frames.