Graviton Momentum: A Natural Source of Dark Energy

The dark energy concept in the standard cosmological model can explain the expansion of the universe.However, the mysteries surrounding dark energy remain, such as its source, its unusual negative pressure, its longrange force, and its unchanged density as the universe expands. We propose a graviton momentum hypothesis,develop a semiclassical model of gravitons, and explain the pervasive dark matter and accelerating universe. The graviton momentum hypothesis is incorporated into the standard model and explains well the mysteries related to dark energy.