Some of Stephen Hawking's theories have revolutionized our understanding of the universe. These include the process of "evaporation" of black holes, called Hawking radiation, the theory of the Big Bang, as well as the paradoxical theorem about the area of a black hole. But some hypotheses of the famous physicist have not yet been confirmed, and still force scientists to puzzle.
Scientists have been working on some of them for many years.
Disappearance of information in a black hole
This is a hypothetical phenomenon that, according to Hawking, should occur in a black hole. However, it is incompatible with the general principles of quantum mechanics and therefore represents a serious paradox that scientists have been struggling with for decades.
Hawking's own view of this hypothesis is that information is not actually lost. It is stored in a cloud of zero-energy particles that surround the black hole, which he calls "soft hair." However, there is still no unequivocal confirmation of his theory.
Primordial black hole
Black holes form as a result of the gravitational collapse of a pre-existing large star. But it is also possible that some of them were created spontaneously during the expansion of the universe shortly after the Big Bang.
Hawking was the first person to come up with this theory. In his opinion, primordial black holes can have almost any mass, from very small to very large. At the same time, cosmologists suggest that primordial black holes with masses in the range from 1014 kilograms to 1023 kilograms can be dark matter. However, current observational data indicate that this is unlikely. In any case, there are currently no tools to detect primordial black holes or tell if they are dark matter.
Protected chronology hypothesis
As surprising as it sounds, modern laws of physics do not rule out time travel. The feasibility of moving in time is mathematically represented by the presence of closed timelike curves in some of the exact solutions of Einstein's general theory of relativity, which actually allows you to return to your past.
Hawking believed that traveling back in time creates logical paradoxes that should not exist. Therefore, he suggested that some currently unknown law of physics prevents the emergence of closed timelike curves.
In the last years of his life, Hawking made a series of dark prophecies regarding the future of humanity.
For example, he speculated that the elusive Higgs boson could cause a vacuum bubble to engulf the universe. In addition, the scientist allowed enemy alien invasions. However, he still continued to search for intelligent civilizations.
Earlier, we also wrote about another forecast by Stephen Hawking related to global warming. He believed that the population of the Earth would grow, energy consumption would increase, and the planet itself would turn into a "blazing fireball" by the year 2600.
And while Stephen Hawking was right about many things, we can only hope that he was wrong about that.