Invisible ‘dark radiation’ may explain a big problem with dark energy

Invisible ‘dark radiation’ may explain a big problem with dark energy

Space

Surprising recent measurements hint that the universe isn’t expanding in the way we had thought, and it could be explained by still-theoretical dark radiation

By Leah Crane

A slice through the largest 3D map of our universe to date

laire Lamman/DESI collaboration

There are hints that the universe may be behaving unexpectedly, and astrophysicists are racing to explain why. Their ideas to account for the surprising result include allowing dark matter and dark energy to interact, and arguing for the existence of strange “dark radiation” that is similar in nature to regular light but invisible.

In April, researchers using the Dark Energy Spectroscopic Instrument (DESI) in Arizona released the biggest 3D map of the universe ever created, and it hinted…

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