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Scientific American Hints of Twisted Light Offer Clues to Dark Energy’s Nature Cosmologists suggest that an exotic substance called quintessence could be accelerating the Universe’s expansion but the evidence is still tentative Print A map of the Universe’s cosmic microwave background radiation, measured by the Planck space observatory. Credit: ESA Advertisement Cosmologists say that they have uncovered hints of an intriguing twisting in the way that ancient light moves across the Universe, which could offer clues about the nature of dark energy the mysterious force that seems to be pushing the cosmos to expand ever-faster. They suggest that the twisting of light, which they identified in data on the cosmic microwave background (CMB) collected by the Planck space telescope, and the acceleration of the Universe could be produced by a cosmic ‘quintessence’, an exotic substance that pervades the cosmos. Such a discovery would require a major revision of current theories

New hampshireUnited statesEiichiro komatsuRobert caldwellMarc kamionkowskiSean carrollYuto minamiCalifornia institute of technologyMax planck institute for astrophysicsJohns hopkins university in baltimoreEuropean space agency planckDartmouth college in hanoverHigh energy accelerator research organizationCalifornia institutePhysical reviewDartmouth college