Stephen Hawking’s work influenced many areas, in particular, cosmology and quantum gravity, in particular in the context of black holes. Today we are interested one of his most famous paradoxes regarding, exactly black holessince the latter, according to the group of scientists that we are about to present to you, will be finally resolved.
In astrophysics, a black hole such a compact celestial object that the intensity of its gravitational field does not allow any form of matter (or radiation) to escape from it. Thus, such objects can neither emit nor scatter light, and are therefore black, which in astronomy is tantamount to saying that they are “optically invisible”.
Black holes phenomena that we do not yet fully understand. Indeed, it is impossible to determine a posteriori what went into a black hole, as you have already understood. And it also works for information. But, view from a distant observer, information is never completely destroyed, since matter falling into a black hole disappears only after an infinitely long time. So, is the information that formed the black hole lost or not? This question has created a paradox: information paradox.
in astrophysics, information paradox This is a paradox noted by Stephen Hawking in 1976, a paradox that pits the laws of quantum mechanics against the laws of general relativity. Indeed, general relativity suggests that information can completely disappear into a black hole after this one evaporates. This loss of information implies the irreversibility and non-unitary evolution of quantum states, which is in fundamental contradiction with the postulates of quantum mechanics. We can sum it up like this : Einstein’s general theory of relativity says that information about what goes into a black hole can’t get out, but quantum mechanics says it can’t.
This paradox has generated a lot of research as it is a very important question in the world of theoretical physics. Famous physicists from around the world studied this issue, offering convoluted explanations. Some scientists have even suggested that aspects of quantum mechanics are wrong. A terrible prospect for theoretical physicists, since quantum mechanics is one of the pillars on which most of our understanding of the universe rests. However, at present we can finally say that laws of quantum mechanics and Einstein’s theory of relativity are well and truly compatible, even when it comes to black holes.
Resolution of the paradox
New study claims to have definitively decided information paradox, showing that black holes have a property they call “quantum hair”. exclaimed Professor Xavier Calmette of the University of Sussex. “Problem solved!”exclusive to BBC News. Professor Calmet and his colleagues claim to have demonstrated that the constituent stars leave an imprint in the gravitational field of a black hole.
Scientists have named this footprint “quantum hair”since their theory replaces an earlier idea called the “no hair theorem” developed in the 1960s. Professor Calmetpublished in a magazine Physical Review Letters, is revolutionary. Not only does he claim that black holes are not “bald” as previously thought, but he also claims to have resolved Hawking’s paradox, which has deeply troubled physicists ever since. 1970s. The concept of “quantum hair” would provide information about what goes into a black hole without violating any of the important principles of both theories. It’s about simple and elegant solution.
Professor Calmet said of his discovery:
It will take time for people to accept it. One consequence of Hawking’s paradox was the incompatibility of general relativity and quantum mechanics. We find that they are fully compatible. Therefore, it will take time for people to recognize that a radical solution is not required to solve the problem.
Research group, which also includes Prof. Roberto Casadio de University of Bologna and Professor Stephen Hsu from Michigan State University, based on the work of Professor Suvrat Raju from the International Center for Theoretical Sciences in Bangalore, India. Professor Raju believes that together they decided Hawking’s paradox. And if you want to know which mysterious message left by Stephen Hawking in his painting can finally be deciphered, you can turn to our previous article on the subject.