Black holes are weird.These amazing objects, the existence of which was finally proved and materially confirmed in 2019, represent a region in space-time, the gravitational attraction of which is so great that objects moving at the speed of light (and even quanta of light itself) cannot leave it. But not all black holes are the same: researchers believe that there are primordial black holes - objects that were supposedly formed at the time of the initial expansion of the universe, when there were no stars or galaxies. It is to them that the attention of the international team of astrophysicists from the Kavli Physics and Mathematics Institute (Japan) is riveted, who put forward an extremely unusual assumption about the role of primordial black holes in the structure of the Universe: the researchers suggested that primordial black holes may be responsible for all or some of the dark matter in the Universe. part, for some of the observed gravitational wave signals, and also serve as the seeds of supermassive black holes located in the center of our and other galaxies.
The most interesting thing, however, is thataccording to a strange new theory, primordial black holes may contain collapsed universes. The authors of the paper, published in the journal Physical Review Letters back in October 2020, believe that our entire universe to an outside observer may look like any other black hole. According to the astrophysicist team, these tiny daughter universes, existing inside primordial black holes couldseparate from the main universe after the Big Bang. Let me remind you that the main idea of the daughter universe theory is that our universe could split into unrelated parts due to the effects of quantum gravity.
See also: Physicists believe that parallel universes exist and soon it will be possible to prove it
Secrets of primordial black holes
In the course of work, a team of astrophysicists with a headplunged into the study of primordial black holes, which are believed to have formed as part of the early universe, when there were still no stars or galaxies. To study these exotic objects, the researchers used the Hyper Suprime-Cam (HSC) camera of Subaru's huge 8.2-meter telescope, located near the summit of Mount Mauna Kea in Hawaii. Subaru is capable of capturing images of the entire Andromeda galaxy every few minutes, helping scientists observe one hundred million stars at a time.
During the work, scientists considered a number of scenarios,especially associated with "inflation" - the period of rapid expansion of the universe after the Big Bang. The researchers calculated that in the process of inflation, the space climate is ripe for the creation of primordial black holes of various masses. Interestingly, some of them reflect the characteristics of dark matter.
“We still do not know what the darkmatter, but since black holes are known to exist, the question of whether dark matter could be made up of black holes that may have formed before stars and galaxies formed is natural, ”an astrophysicist at the University of California told Motherboard in Los Angeles and the lead author of the study, Alexander Kusenko.
Another way they couldto form primary black holes - the theory of the daughter universe. In a press release for the study, the authors of the scientific work note that "the infant or daughter universe would eventually collapse, and a huge release of energy would lead to the formation of a black hole." Interestingly, the demise of some of the large daughter universes would hardly have gone unnoticed. According to the theory of gravity, developed by Albert Einstein, such a universe can be perceived by observers in different ways. If you were inside it, you would see the expanding Universe. But if you were outside, this child universe would look like a black hole.
For even more fascinating articles on how our Universe works and what black holes can hide, read our channel in Yandex.Zen. There are regularly published articles that are not on the site.
If you follow this logic of the multiverse, thenit is possible that while primordial black holes appear to us as black holes, their true structural nature may be obscured by their "event horizons" - the boundaries surrounding black holes from which even light cannot escape. Inside these objects, according to Kusenko, there may also be tiny universes devoid of matter that began and failed to form when our own universe was expanding rapidly.
It should be noted that, although strange and,seems to be contrary to common sense, this is far from the first scientific work, reflecting such ideas. A study earlier in 2020 showed that so-called “charged” black holes can include infinitely repeating fractal universes of various sizes, including miniature ones, that can stretch and deform in all directions.
Moreover, the theme of the Multiverse todayso popular that in 2020 it became the main topic of the popular science festival Geek Picnic, which I discussed in detail in this article. I recommend reading to all fans of the multiverse.
As noted by the members of the international team,behind the study, astrophysicists will continue to observe with the Subary telescope in the future, which means we may have some amazing discoveries. So let's hope that the collaborative efforts of researchers will shed much-needed light on the nature of dark matter, daughter universes and others, no less. intriguing questions about our universe.