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Mysterious force

发布时间:2019-03-07 04:14:01来源:未知点击:

BY BOTTLING the Universe in a computer, astronomers believe they have divined what makes galaxies cluster together: cold dark matter and the cosmological constant. Carlos Frenk of the University of Durham and his colleagues ran a series of simulations tracking the motion of a billion galaxies. As Frenk reported at Britain’s National Astronomy Meeting in Guernsey last week, the simulation only produced a realistic pattern of galaxies if two assumptions were made about the Universe: that it is inhabited by cold dark matter and that there is a mysterious force—the cosmological constant—that stretches space. “When you don’t have the cosmological constant, nothing really works well,