Gravitational Differential Expansion: The Hypothesis of the Driving Mechanism of the Gravitational Center on the Expansion of the Universe

The hypothesis of this study proposes that the expansion of the universe may be caused by gravitational differentials rather than dark energy. It is assumed that there are one or more gravitational centers outside the visible universe. Since the visible universe is not located at the center of gravity of the gravitational center, the gravitational forces on celestial bodies in different regions are different, forming an acceleration difference, which causes the celestial bodies to move relatively far away, thus causing expansion. The hypothesis derives the conditions for the expansion to occur: when the gravitational differential exerted by the gravitational center on the celestial body is greater than the gravitational force between them, the expansion effect occurs. In addition, it is assumed that the displacement relationship between the visible universe and the gravitational center can be revealed through the change of the Hubble constant, including rotation around the gravitational center, falling into or leaving. Although this hypothesis is different from the dark energy hypothesis, it does not deny the existence of dark energy. It is believed that gravitational differentials and dark energy may work together to explain the accelerated expansion of the universe. This theory provides another possibility for the expansion of the universe, which needs to be verified by observation.