Stephen Hawking was an icon of science. In addition to opining on the danger of Artificial Intelligence, Hawking appeared in a large number of programs, for example, The Big Bang Theory or even the Simpsons. It was a character in all senses. Academically he won all the awards that a physical you can get to get (not counting the Nobel Prize), and gave more than 15 honorary doctorates.
Hawking worked some 20 years of his life in a theory, which says that in a certain place, space must be other planets similar to the Earth where you can still walk the dinosaurs and where they hunt the neanderthals. Hawking sent a review of his writing, about 10 days before dying. Also talks about the science of celestial bodies that are completely different from our own, suns, no galaxies, for example, but which are governed by the same laws of physics that we know. This type of assumptions are part of the theory of the cosmos that Hawking proposed, which was published in the journal High Energy Physics.
As we said already, Hawking sent a review of his article 10 days before his death, and offers an image more simple of what most likely happened a few 13,800 million years ago, when it all began, that is to say, the universe itself. The work of the british physicist is the result of a long collaboration of more than two decades between Hawking and Thomas Hertog, a physicist from Belgium, the Catholic University of Louvain. Basically the theory indicates that reality could be composed of multiple universes but each one of them would not be so different from our own.
If this is true, some of the issues raised earlier by the own Hawking may have a solution, and in addition, it could be the physical poses a way forward on the part of the astronomers to find any evidence of parallel universes.
It must be said that in the early 1090, Hawking, together with James Hartle, of the united States, developed a new conception about the origin of the Universe. The tenets to which they came they solved a problem that was crawling from the theories of Albert Einstein, which suggested that the Universe could be about 14 billion years ago, but did not explain anything about how it originated.
The theory most accepted is that for 14 billion years after the big bang, the Big Bang, the Universe was born and started to expand. But Hartle and Hawking said that could have been generated in that same moment of the big bang, other universes, an infinite number of them. It would be expected that all those universes were very similar to ours and that the laws of physics that govern them will work equally for them, but like, in a way very similar. In mathematical terms, the theory presented is theoretically possible.
This idea, however, has its own problems. Because if there are an infinite number of universes, with infinite variations in their laws, then how predict which of them will find us? “Neither Stephen nor I were happy with that scenario,” says Thomas Hertog, who tried to find a solution to this problem for 20 years in the company of Hawking. “It is suggested that the multiple universes emerged by chance and that we can not explain much more about that. We said among ourselves: ‘we May have to live with that’. But we didn’t want to give up.”
And this is precisely the latter theory in that he worked Hawking. To do this, they decided to use the theory of strings, which is not proven by any experiment, and it seems to be a theoretical model very interesting, but until now indemostrable. In this revision of the theory proposed, it is suggested that there can be only universes that have the same physical laws that our. This could mean that it is possible to detect these parallel universes. “The laws of physics that we tested in our labs, there were always, emerged after the Big Bang, when the universe expanded and cooled,” explains Hertog.
And is that the problem to be solved is at the bottom why the physical laws are as they are? What are the best laws possible? Why don’t seem to have inconsistencies? There could be other universes with other physical laws? “We intend to gain a deeper understanding of where they come from our physical theories, how they arise and whether they are unique,” says Hertog.
Another problem is how could we detect the existence of other parallel universes. According to Hertog, could be detected the presence of other universes in studying the radiation of microwaves which supposedly remained after the Big Bang. However, it all seems very speculative at the moment.