Black Hole Remnants and the Information Loss Paradox

Understand

Forty years after the discovery of Hawking radiation, its exact nature remains elusive.

• If Hawking radiation does not carry any information out from the ever shrinking black hole, it seems that unitarity is violated once the black hole completely evaporates.
• On the other hand, attempts to recover information via quantum entanglement lead to the firewall controversy.
• Amid the confusions, the possibility that black hole evaporation stops with a "remnant" has remained unpopular and is often dismissed due to some "undesired properties" of such an object.