Physicists find wild neutrinos, dark energy in the early universe

Theoretical physicists have investigated the universe’s earliest era to look for clues to how the cosmos expanded in its first few hundred thousand years. Its behavior back then has implications for its expansion now, more than 13 billion years later. The new results, published July 26 in Physical Review Letters, show that the balance of radiation and matter — part of what determines how fast the universe becomes larger — tipped in favor of radiation for longer than researchers had thought.

The team says two things could explain the anomaly: fast-moving particles called “wild” neutrinos — an early version of the nearly massless and abundant particles in the universe today — or “early” dark energy — a phenomenon that could have been 1-10 times more powerful than today’s dark energy.

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About nickwinlund

40s-something macOS enthusiast.
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