The long-derided cosmological constant--a contrivance of Albert Einstein's that represents a bizarre form of energy inherent in space itself--is one of two contenders for explaining changes in the expansion rate of the universe
This article was originally published with the title "Cosmological Antigravity"
ABOUT THE AUTHOR(S)
Lawrence M. Krauss
Lawrence M. Krauss is director of the Origins Project and Foundation Professor in the School of Earth and Space Exploration at Arizona State University. A widely-published theoretical physicist and cosmologist, he is also the author of bestselling books including A Universe from Nothing. Krauss is also a member of Scientific American's Board of Advisers.