Einstein’s equivalence principle still holds up, even at the quantum level. Doesn’t solve quantum gravity. So much we still don’t understand. www.science.org/doi/10.1126/...
Observation of the quantum phase of free fall and the consistency with the equivalence principle
The unification of quantum theory and the general theory of relativity, describing gravity, is one of the most important challenges in science. Einstein’s general theory of relativity is based on the ...
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