Bubbles in the early universe may have filtered heavy dark matter
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B allooning cosmic bubbles in our early universe may have led to the current abundance of dark matter. “Although we know how much dark matter our universe contains, for decades now we’ve been left wondering about dark matter’s nature and origin,” said Andrew Long, an assistant professor of physics at Rice University in Houston. “Is dark matter a collection of elementary particles? If so, what are the properties of these particles, such as their mass and spin? What forces do these particles exert and what interactions do they experience? When was the dark matter created, and what interactions played an important role in its formation?”