Nonetheless, they have led to important developments, because the negative results have ruled out some plausible hypotheses. And, though researchers may not have found results supporting any one theory, they have advanced the cause of science by better defining the observational criteria any quantum theory of gravity will have to take into account.
目前，这些尝试都没有发现想要的证据。尽管如此，它们还是带来了重要的发展，因为消极结果排除了一些似是而非的假说。此外，尽管研究者尚未发现支持任何一种理论的结果，但他们通过更好地定义任何引力的量子理论都必须考虑的观察标准推动的科学进步。