www.sciencedaily.com
New research challenges the long-held belief that dark matter was originally cold and sluggish. Scientists now suggest that “red-hot” dark matter may have been birthed as relativistic particles moving near light speed shortly after the Big Bang. By examining the chaotic “post-inflationary reheating” era, researchers found this hot dark matter could cool down over time. Despite its hot origin, it remains capable of driving the gravitational forces needed to build the universe’s large-scale structures today.
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