The unification of quantum mechanics and Einstein's general relativity is one of the most exciting and still open questions in modern physics. General relativity, the joint theory of gravity, space ...

The world's most precise clocks can reveal tiny time dilations predicted by Einstein's theory of relativity — but that's not all. Tom O'Brian of the National Institute for Standards and Technology ...

A team of researchers at the JILA, National Institute of Standards and Technology at the University of Colorado has found a way to use an atomic clock to demonstrate a principle of general relativity.

A millimeter might not seem like much. But even a distance that small can alter the flow of time. “This is fantastic,” says theoretical physicist Marianna Safronova of the University of Delaware in ...

Researchers at at JILA, a joint institution of the US National Institute of Standards and Technology (NIST) and the University of Colorado Boulder have developed an atomic clock that can detect the ...

For over a century, physicists have grappled with one of the most profound questions in science: How do the rules of quantum mechanics, which govern the smallest particles, fit with the laws of ...

In the gloomy days of January, time seems to drag. According to the Einstein theory of relativity, it actually does—in a minute amount that means little to anyone except a scientist. During its annual ...

As Einstein predicted, a slow drive or a step up a ladder is enough to warp time. You have full access to this article via your institution. Albert Einstein's theories of relativity, which predict ...

General relativity, the joint theory of gravity, space and time gives predictions that become clearly evident on a cosmic scale of stars and galaxies. Quantum effects are fragile and observed on small ...