Life, Death and the Eagle

[serloco]

The black hole information paradox[1] results from the combination of quantum mechanics and general relativity. It suggests that physical information could permanently disappear in a black hole, allowing manyphysical states to devolve into the same state. This is controversial because it violates a commonly assumed tenet of science—that in principle complete information about a physical system at one point in time should determine its state at any other time.[2][3] A fundamental postulate of quantum mechanics is that complete information about a system is encoded in its wave function up to when the wave function collapses. The evolution of the wave function is determined by a unitary operator, and unitarity implies that information is conserved in the quantum sense.

Black hole information paradox - Wikipedia, the free encyclopedia