Physics

Two leading candidates for a “theory of everything,” long thought to be incompatible, may be two sides of the same coin.

The irreversibility of time may be a clue as to what makes up the universe’s dark matter.

If a theory can’t be tested, is it still science?

Three computer scientists have solved a problem central to a dozen far-flung mathematical fields.

The physical nature of computers might reveal deep truths about their uniquely powerful abstract abilities.

The physicist Gabriela González is on the cusp of finding the first direct evidence of gravitational waves — soundlike wobbles in space-time produced by black holes and their kin.

Nima Arkani-Hamed is championing a campaign to build the world’s largest particle collider, even as he pursues a new vision of the laws of nature.

Einstein refused to believe in the inherent unpredictability of the world. Is the subatomic world insane, or just subtle?

In the drive to safeguard data from future quantum computers, cryptographers have stumbled upon a thin red line between security and efficiency.