Dark energy must die – these rebel physicists can take it down

 作者:东方舨计     |      日期:2019-03-15 07:03:02
Steven Wilson By Anil Ananthaswamy NOT so long ago, in a galaxy really rather close by, a small band of rebels has taken up arms to overthrow a dark empire… No, this isn’t bad Star Wars fan fiction. It’s a pretty good description of a battle for cosmology going on right now. On one side is the mighty firepower of cosmology’s standard model. It brings order to everything from the patterns in the big bang’s afterglow to the evolution of galaxies. But it can only do so using dark powers. There’s dark matter, an additional unseen stuff amounting to a quarter of everything in the universe, which keeps galaxies and clusters of galaxies in line and stops them from flying apart. Far outgunning even this, however, is dark energy. Representing more than two-thirds of the universe, dark energy is a mysterious, expansionist force whose very identity is unknown – but which has dominated the cosmos for the past 5 billion years. Not for much longer, if the rebels lining up on the other side against the universe’s established order have anything to do with it. “In 10 years’ time, dark energy is gone,” says Thomas Buchert of Claude Bernard University in Lyon, France. Dark energy’s power, the insurgents claim, is a mere illusion created by the machinery of the standard model itself. They now aim to bring it down. At the heart of this unbalanced conflict lies a founding principle of the universe – or at least,