It is believed that the universe appeared as a result of the Big Bang, but some physicists are not so sure about the firmness of this statement.
Why does the universe exist? How did it really start? What happened before the Big Bang? Theoretical physicists continue to seek answers to these questions. For example, Stephon Alexander from Brown University, USA, believes that our Universe has neither beginning nor end, if we talk about the time of its existence, writes Science Focus.
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From a cosmological point of view, there is a connection between the birth of stars, the formation of planets, and the expansion of the universe. This cosmic creation is unfolding through the interaction of the expansion rate of the universe, the gravitational contraction of dark matter, and the capture of hydrogen, which gave rise to all stars. Therefore, the history of the origin of the Universe is connected with the search for an answer to the question of how exactly the expanding space-time appeared.
According to the main theory of the origin of the universe, it arose as a result of a colossal explosion about 13.8 billion years ago. Then its rapid expansion began, and this idea is supported by Einstein’s general theory of relativity.
“But if you imagine the history of the universe as a movie, then if you rewind to its beginning, you can see how it shrinks into an infinitesimal point with infinite temperature, energy and space-time curvature. This is the Big Bang singularity. For example, Stephen Hawking most of his life tried to understand this singularity. But if everything, including time itself, came into being as a result of the Big Bang, how can you talk about something that happened before there was time? But such theories exist, and one of them was proposed by myself, which trying to explain that it’s actually possible that the Big Bang wasn’t the beginning of everything,” says Alexander.
Our Universe has neither beginning nor end, if we talk about the time of its existence.
Photo: Live Science
One such theory suggests that before the Big Bang, there was a very different space age with new physics capable of replacing the singularity. But according to Alexander’s theory, there is a so-called cyclical inflation, that is, it is a constant process that combines the expansion of the universe, and then its contraction to its original state. In fact, this is an endless process of transformation of the Universe, when it either increases or decreases again in size.
“After a critical cycle, when sufficient entropy has accumulated, the universe experiences a rapid acceleration of space-time expansion known as inflation. Cyclic inflation takes advantage of conventional inflation by offering a potential exit from the Big Bang singularity,” says Alexander.
The scientist believes that now we need to find evidence of this theory in the space around us, which will lead to an accurate understanding of the origin of the universe.
“I believe that hints of the correctness of this theory can be found by studying black holes. For example, supermassive black holes seem to form too early to be explained by our current cosmological standard model. Perhaps this cosmic anomaly can be explained using infinite cycles that the universe goes through,” says Alexander.
Focus already wrote that according to the new theory of astrophysicist Avi Loeb, the Universe was created in the laboratory by aliens. According to him, only the most developed civilization can afford this, and humanity is still very far from that.
