Dark energy

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One of the two greatest mysteries of the universe
In 1999, two research groups reported their observations that the expansion of the universe has been accelerating for the last seven billion years. This expansion, which began with the Big Bang, had been predicted to ultimately decelerate because of the gravitational force that draws matter together. Professor Masahiro Takada, of the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU) at the University of Tokyo, describes the reaction to this surprising observation. “It’s as if you threw a ball upwards and it kept accelerating higher into the sky, rather than returning to earth.” The accelerating expansion of the universe has been attributed to dark energy. Figure 1: Einstein’s equations of general relativityGμν on the left side of the equation is th...Academic Information

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