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A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon.

The black hole information paradox is a puzzle resulting from the combination of quantum mechanics and general relativity.Calculations suggest that physical information could permanently disappear in a black hole, allowing many physical states to devolve into the same state. This is controversial because it violates a core precept of modern physics—that in principle the value of a wave ...

This artist's concept shows a galaxy with a supermassive black hole at its core. The black hole is shooting out jets of radio waves. Image credit: NASA/JPL-Caltech (Phys.org) —Physicists Rodolfo ...

10 Cloning. The black hole information paradox is an enigma that has eluded physicists for centuries now. It has been the trigger for endless debates on what actually happens once you enter a black hole.

Gravitational waves have opened up new ways to test the properties of black holes — and Einstein’s theory of gravity along with them. We all dream the same dream, here in theoretical physics. We dream of the day when one of our equations will be plotted against data and fit spot on. It’s rare ...

Open tools for black hole perturbation theory Introduction Toolkit and Data Repository Status and Documentation Contributors and Users. The Black Hole Perturbation Toolkit brings together software and data relating to black hole perturbation theory.

Black holes may answer questions about the beginning and the future of the universe.

The idea of an object in space so massive and dense that light could not escape it has been around for centuries. Most famously, black holes were predicted by Einstein's theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core.

Black hole definition, a theoretical massive object, formed at the beginning of the universe or by the gravitational collapse of a star exploding as a supernova, whose gravitational field is so intense that no electromagnetic radiation can escape. See more.

Details of the structure of a black hole are calculated from Albert Einstein’s general theory of relativity.The singularity constitutes the centre of a black hole and is hidden by the object’s “surface,” the event horizon.Inside the event horizon the escape velocity (i.e., the velocity required for matter to escape from the gravitational field of a cosmic object) exceeds the speed of ...