Physics

While devising a new quantum algorithm, four researchers accidentally established a hard limit on entanglement.

For decades, extremal black holes were considered mathematically impossible. A new proof reveals otherwise.

The largest-ever 3D map of the cosmos hints that the dark energy that’s fueling the universe’s expansion may be weakening. One community of theoretical physicists expected as much.

A long-awaited study of the cosmic expansion rate suggests that when it comes to the Hubble tension, cosmologists are still missing something.

Tensors are used all over math and science to reveal hidden geometric truths. What are they?

Carbon dioxide’s powerful heat-trapping effect has been traced to a quirk of its quantum structure. The finding may explain climate change better than any computer model.

Experiments that test physics and philosophy "as a single whole" may be our only route to surefire knowledge about the universe.

One of the quantum fields that fills the universe is special because its default value seems poised to eventually change, changing everything.

Physicists have ruled out a mundane explanation for the strange findings of an old Soviet experiment, leaving open the possibility that the results point to a new fundamental particle.