反引力的 meaning in English

counterattractive

For many years the cosmological constant was assumed to be zero , since no measurement gave positive indication to the contrary . if gravity were the only force acting to alter the expansion rate , then the universe would be expected to be decelerating
以纯理论探讨来说，我们当然可以保留这个宇宙常数，但多年来的天文观测结果，并不支持这个宇宙反引力的存在，所以科学家一直假设这个常数为零。