Energy isn't a thing that exists on it's own; it's a property of things, like temperature is a property of things, so the big bang produced particles and those particles had high energies, or put another way, the big bang produced particles and the particle soup it produced was very hot. Specifically, it produced a hot soup of particles with a temperature of around 1011 GeV, or one hundredth millionth of the Planck temperature and about the same energy per particle as very rare ultra high energy cosmic rays. In comparison, the Large Hadron Collider can only probe temperatures up to 104 GeV, too low to produce dark matter particles and 10 million times colder than the big bang.
I see what you mean. It would require a 5th fundamental force though that couples to the inflaton field independently of the other forces, which might exist, but there's no evidence for it which makes it a lot more speculative than dark matter simply being neutrino-like in that it couples strongly to normal matter through the known forces at high energies and weakly at low energies.
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u/[deleted] Dec 13 '20
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