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A map of dark matter based on data from the VLT Survey Telescope at ESO's Paranal Observatory in Chile. Lighter-colored areas in the image are denser.Aside from that, though, we're pretty clueless. We don't know what dark matter is or where it came from, and if it is made of some kind of weakly-interacting form of matter, we still can't directly detect a single particle of it.
Yet given its gravitational sway on galaxies and galaxy clusters – plus other clues, like its effect on the cosmic background radiation – we have strong evidence dark matter exists. We're just still in the dark about nearly everything else, including what it is and where it came from.Decades of searching have yielded no confirmation of WIMPs' existence, dimming their allure a bit and displacing more scientific interest toward other possible explanations of dark matter.
According to Freese and Winkler, however, a Dark Big Bang is consistent with the evidence for dark matter – as long as it happened promptly, within about a month of the first Big Bang. Their work helps strengthen the case introduced by Freese and Winkler, not only confirming the possibility of a Dark Big Bang, but also comprehensively assessing the range of ways such an event might have unfolded.
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