what does this statement mean..?actually complete statement is--(adsbygoogle = window.adsbygoogle || []).push({});

" Einstein field equation is not very choosy about what kinds of states of matter or nongravitational fields are admissible in a spacetime model. This is both a strength, since a good general theory of gravitation should be maximally independent of any assumptions concerning nongravitational physics, and a weakness, because without some further criterion, the Einstein field equation admits putative solutions with properties most physicists regard as unphysical, i.e. too weird to resemble anything in the real universe even approximately"

Can anyone please explain it physically

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# EFE is not choosy about nongravitational fields are admissible in a spacetime model.

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