I assume that all the fundamental physics known - as of today - can be reduced to quantum general covariant fields (including spacetime itself to be seen as a field of those...).(adsbygoogle = window.adsbygoogle || []).push({});

Now, sorry if my question is quite abstract and based on tomorrow's hypothetical new physics, but would it be against GR should they discover - one day in the future - a new quantum field not being covariant? Is that either in principle ruled out as incompatible with GR or there is a theoretical possibility of extending the GR to new physics outside the domain of validity of the GR - let's say like an extension of the SM?

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# Covariant fields and new physics

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