Gravity

Spurred on by quantum experiments that scramble the ordering of causes and their effects, some physicists are figuring out how to abandon causality altogether.

Featuring paradoxical black holes, room-temperature superconductors and a new escape from the prison of time.

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?

Claudia de Rham showed how theories of “massive gravity” could potentially get rid of the need for dark energy.

New calculations show how hypothetical particles called gravitons would give rise to a special kind of noise.

We asked four physicists why gravity stands out among the forces of nature. We got four different answers.

By chewing on the problems posed by “extremal” black holes, physicists have exposed a surprising and universal connection between energy and entropy.

Einstein’s equations describe three canonical configurations of space-time. Now one of these three — important in the study of quantum gravity — has been shown to be inherently unstable.

For the first time, physicists have calculated exactly what kind of singularity lies at the center of a realistic black hole.