it’s actually by far the weakest of the four known forces of nature – and the only one not explained by quantum theory. Quantum theory and general relativity in fact don’t get along at all.

Albert Einstein's theory of general relativity—which explains gravity ... What "3 sigma" means, Grimm explained, is that the difference is interesting and merits further investigation.

Albert Einstein’s theory of gravity, general relativity, is famously incomplete. As proven by physics Nobel laureate Roger ...

At its core is a fairly simple idea—all particles ... while predicted by general relativity, have never been fully explained at the quantum level. Using one type of string theory, physicists ...

An international research team's new calculations of the distortion of time and space presents new challenges to predictions ...

Scientists test the famous physicist’s predictions by calculating the distortion of time and space. Why is the expansion of ...

In a fascinating twist of theoretical physics, scientists may have calculated how an elusive particle, the tachyon, could ...

Despite explaining astronomical phenomena far better, general relativity became deeply unfashionable, as it failed to explain what happens deep inside the atom. Einstein’s big idea was the ...

“We proved that the Einstein field equation from general relativity is actually a relativistic quantum mechanical equation,” ...

Researchers used the Dark Energy Spectroscopic Instrument to map how nearly 6 million galaxies cluster across 11 billion years of cosmic history. Their observations line up with what Einstein's theory ...

Find out more about available formats and browse any associated online resources. General relativity is a subject that most undergraduates in physics are particularly curious about, but it has a ...

This text on general relativity and its modern applications is suitable for an intensive one-semester course on general relativity, at the level of a Ph.D. student in physics. Assuming knowledge of ...