Study validates general relativity on cosmic scale, existence of dark matter
Image 1: This image shows some of the 70,000 luminous galaxies in the Sloan Digital Sky Survey analyzed in this paper. Image: Sloan Digital Sky Survey CollaborationImage 2: Princeton University scientists (from left) Reinabelle Reyes, James Gunn and Rachel Mandelbaum led a team that analyzed more than 70,000 galaxies and demonstrated that the universe -- at least up to a distance of 3.5 billion light years from Earth -- plays by the rules set out by Einstein in his theory of general relativity. Image: Princeton University, Office of Communications, Brian Wilson
"One of the first proper theories of modified gravity is called the tensor-vector-scalar theory, or TeVeS," says Uros Seljak, a member of Lawrence Berkeley National Laboratory's Physics Division, who is also a professor of physics and astronomy at the University of California at Berkeley and a professor of physics at the University of Zurich. "By a 'proper' theory, I mean one that makes definite predictions about what we should be able to observe if it is true."
"Our measurement combines gravitational lensing, galaxy clustering, and the growth rate of the large-scale structure of the universe," Seljak explains. "No one of these by itself could test modified gravity theories because of large uncertainties in the observations at cosmological distances."
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