Here is a quote from Brian Greene, The Fabric of the Cosmos: Space, Time, and the Texture of Reality, p. 273:
“The early universe provided an arena in which gravity exerted its repulsive side with a vengeance, driving every region of space away from every other with unrelenting ferocity.”
Relativity proves that spacetime is curved by gravity, but isn’t space expanding different from space curvature? In other words, how does negative gravity exert a force on space? If the universe stopped expanding, like in a “bounce” theory, would the expanse of space (containing the Higgs field and cosmological constant) contract as the density of mass and energy increased?