Black hole information paradox

As one of the most famous problems in theoretical physics, the black hole information paradox has long been regarded as an important way to study quantum gravity. A core problem of the paradox is to give the Page curve for the evaporation of black holes. In the past year, research on this issue has seen various breakthroughs. For the first time, researchers have been able to reproduce the Page curve under the semi-classical gravitational framework, suggesting that information can be released during the evaporation of black holes, with no information loss. This article will describe the black hole information paradox and, in the order of historical development, the latest achievements in this area, including the Hawking radiation, Page curve, holographic principle, generalized entropy, quantum extremal surface, and quantum extremal island.