Two scientists think a double-Big-Bang scenario could explain dark matter and why we haven’t been able to detect it.
We know dark matter exists because nothing else can supply enough gravity to hold stars within their galaxies—at least, not unless our understanding of gravity is somehow wrong. Dark matter has played this crucial role since right after the Big Bang. Like a kind of cosmic usher, dark matter guided the atoms to their seats with its gravitational pull.
But where did dark matter come from? Most theories say it was made in the same Big Bang as everything else, but Winkler and Freese started to question that assumption. “It is often forgotten that we have zero evidence for dark matter before the times relevant for structure formation,” Winkler said. So maybe dark matter wasn’t around yet when regular matter formed.
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