7 February 2006
Most cosmologists believe that the universe is dominated by “dark energy” — a mysterious form of energy that could explain why the universe is expanding and accelerating at the same time.
Now, however, theoretical physicists have studied a new model of gravity that can, they claim, account for the acceleration of the universe without any need for dark energy.
Their model relies instead on modifications to the way that gravity behaves at ultra-large cosmological distances (Phys. Rev. Lett. 96 041103).