پارادخش ِ ازدایش pârâdaxš-e azdâyeš
*Fr.: paradoxe de l'information*
A paradox raised in 1976 by S. Hawking (1942-2018) whose analysis of
the thermodynamic properties of → *black hole*s
led him to the prediction that black holes are not in fact black, but
radiate due to quantum effects. This implied that, due to the
→ *Hawking radiation*, a black hole would
eventually evaporate away, leaving nothing. This deduction presented
a problem for → *quantum mechanics*,
which maintains that
information can never be lost.
This topic is a matter of intense debate. Many solutions have been
proposed, but all of them have serious drawbacks. In
order to analyze better these solutions one needs a quantum gravity
theory, which does not exist at the moment.
In brief, either the idea of → *quantum unitarity*
must be given up, or
a mechanism should be found by which information is not lost after it
falls into a black hole. → *information*; → *paradox*. |