We know dark matter is out there. Astrophysical observations of gravitational effects provide evidence of its existence at all times, from the time of nucleosynthesis (a few minutes after the big bang) to the moment in which the cosmic microwave background radiation was released (300,000
In separate reports, one appearing in Physical Review Letters , the other on the arXiv , two collaborations—the Cryogenic Dark Matter Search (CDMS) experiment at Fermilab in Illinois and the Large Underground Xenon (LUX) experiment in South Dakota—present the results from their searches for dark matter candidate particles called weakly interacting massive particles (WIMPs). Both collaborations attempt to directly detect WIMPs as they scatter off the nuclei of a detector. CDMS finds a signal that could potentially be assigned to WIMPs. But LUX, with nominally better sensitivity, sees no evidence of such dark matter particles.To read more, click here.