The Guardian reported that the work tackles something that theoretical physicists are calling the information paradox and it was completed in the days before Hawking passed away.
The final paper he contributed to, titled "Black Hole Entropy and Soft Hair", concerns what theoretical physicists call the information paradox - what happens when an object falls into a black hole? Entropy rises the hotter an object gest leading the physicists to speculate that a black hole's entropy may be recorded by soft hair. The difficulty is that if you throw something into a black hole it looks like it disappears.
Among the unknowns that Perry and his colleagues must now explore are how information associated with entropy is physically stored in soft hair and how that information comes out of a black hole when it evaporates.
At its core, the theory addresses the problematic nature of black holes, which Albert Einstein believed had only three features - mass, charge and spin. As such, black holes "must inevitably burn themselves out into nothing as they lose energy", explains the London Evening Standard.
One of the fundamental tenets of physics is that information can never be completely erased from the universe.
He reasoned that, at least in part, the information that enters a black hole goes into "soft hair" - a haze of photons at the event horizon, the outer periphery of a black hole and its point of no return.
Stephen Hawking's last scientific paper, which he was working on just before he died, could unlock a mystery he grappled with for much of his life. "We still don't have the technology to verify Stephen Hawking's big ideas". Perry called Hawking to give him an update, unaware of how ill he was. When I explained it, he simply produced an enormous smile.
If an object is put into a black hole, the hole's temperature is bound to be affected as well as its entropy, a measure of an object's internal disorder.