What are the discrete symmetries of General Relativity? Is it invariant under CP, C, P,T or all?
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1$\begingroup$ How would you define C, P, and T in the context of GR? $\endgroup$– TimRiasCommented Nov 8, 2023 at 16:41
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$\begingroup$ Pure GR with no matter, or GR + the standard model? $\endgroup$– AndrewCommented Nov 8, 2023 at 18:09
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$\begingroup$ @Andrew GR coupled to matter. $\endgroup$– KaraboMadisaCommented Nov 8, 2023 at 19:53
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$\begingroup$ @TimRias. Am not sure. I am currently studying an introduction to particle physics where the author mentions the discrete symmetries of the standard model. I am wondering if GR also has discrete symmetries such as Charge conjugation, Parity and Time Reversal. If not, I'd also like to know why. $\endgroup$– KaraboMadisaCommented Nov 8, 2023 at 19:57
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$\begingroup$ Since C, P, and T are not symmetries of the standard model, they won't be symmetries of GR coupled to the standard model (even after addressing @TimRias's point). $\endgroup$– AndrewCommented Nov 8, 2023 at 23:58
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