General relativity

Physicists hope that understanding the churning region near singularities might help them reconcile gravity and quantum mechanics.

A black hole formula worked out in the 1970s remains the most concrete clue physicists have about the threads of the space-time fabric.

The philosopher Karen Crowther digs into how the space-time fabric could possibly emerge from something non-spatiotemporal.

These three imagined scenarios lead many physicists to doubt that space-time is fundamental.

Until his dying days, the giant of 20th-century physics obsessed over the underpinnings of space and time, and how we can all share the same version of them.

This special issue of Quanta Magazine explores the ultimate scientific quest: the search for the fundamental nature of reality.

For decades, extremal black holes were considered mathematically impossible. A new proof reveals otherwise.

Tensors are used all over math and science to reveal hidden geometric truths. What are they?

By studying the geometry of model space-times, researchers offer alternative views of the universe’s first moments.