Exploring the BTZ black hole in (2+1)-dimensional gravity took me down a fascinating rabbit hole, connecting ideas I never expected—like black holes and topological phases in quantum matter ...

A new theory suggests that “time” might be the product of a universe that, long ago, decided to settle down into one ...

Massive ripples in the very fabric of space and time wash over Earth constantly, although you'd never notice. An astrophysicist is trying a new search for these gravitational waves.

The entangled clocks can test how quantum theory behaves in the presence of curved space-time as predicted by Einstein, or whether our current theories break down. Hoboken, N.J., July 14, 2025 ...

String theory is perhaps the most high-profile candidate for what physicists call a theory of everything – a single ...

Black hole and Big Bang singularities break our best theory of gravity. A trilogy of theorems hints that physicists must go ...

Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time—the interwoven fabric ...

It’s not so much the galaxies that are moving away from each other – it's the space between galaxies, the fabric of the universe itself, that’s ever-expanding as time goes on.

But to get there requires a radical reshaping of Einstein’s General Theory of Relativity. The new idea is called Shape Dynamics, and it just may be our future theory of gravity.

Black holes — regions of space-time with extreme curvature — first arose as a concept from solutions to Einstein's field equations suggested by German physicist and astronomer Karl ...

Two blind spots torture physicists: the birth of the universe and the center of a black hole. The former may feel like a moment in time and the latter a point in space, but in both cases the normally ...

Three-dimensional time is a theory that has been proposed before, though generally in pretty inaccessible terms. Similarly to the explanation for three dimensions of space — length, width, and ...