dark matter

Today’s long-anticipated announcement by Fermilab’s Muon g-2 team appears to solidify a tantalizing conflict between nature and theory. But a separate calculation, published at the same time, has clouded the picture.

Black holes seemed to come only in sizes small and XXL. A new search strategy has uncovered a black hole of “intermediate” mass, raising hopes of more to come.

Physicists plan to leave no stone unturned, checking whether dark matter tickles different types of detectors, nudges starlight, warms planetary cores or even lodges in rocks.

It was an old idea of Stephen Hawking’s: Unseen “primordial” black holes might be the hidden dark matter. A new series of studies has shown how the theory can work.

Cosmologists have concluded that the universe doesn’t appear to clump as much as it should. Could both of cosmology’s big puzzles share a single fix?

Modified gravity theories have never been able to describe the universe’s first light. A new formulation does.

Researchers say there are three possible explanations for the anomalous data. One is mundane. Two would revolutionize physics.

Physicists have proposed extra cosmic ingredients that could explain the faster-than-expected expansion of space.

In a new paper, physicists argue that hypothetical particles called axions could explain why the universe isn’t empty.