Dark matter could be a cosmic relic from extra dimensions

Massive gravitons may have formed a trillionth of a second after the Big Bang, in abundances great enough to account for dark matter.

Dark matter, the elusive substance that accounts for the majority of the mass in the universe, may be made up of massive particles called gravitons that first popped into existence in the first moment after the Big Bang.

And these hypothetical particles might be cosmic refugees from extra dimensions, a new theory suggests.

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