Our universe lived even before the Big Bang. Not Earth but THIS was present inside this cosmos

In a breakthrough study, the scientists have now hinted that the beginning of the universe may not have started from the Big Bang.

As per the new theory of cosmology, the universe may have "bounced" from the phase of contraction to that of expansion and vice versa.

In a recent study, scientists suggested that the dark matter was most probably composed of black holes when the universe was transiting from its last contraction to the ongoing expansion phase, which took place before the Big Bang.

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This scenario of the generation of dark matter can be formed by future gravitational wave observatories, which can detect the gravitational waves generated during the process of black hole formation if the hypothesis is correct.

Also Read:Early universe galaxies appear monstrous because of black holes

The cosmic microwave background and the stellar movements in galaxies have indicated that dark matter is present in 80 per cent of all matter in the universe. However, scientists have still not been able to understand what the dark matter is made of.

Here's what the universe was like before the Big Bang

The researchers, in a new study, explored the scenario when dark matter was filled with primordial black holes which were formed because of density fluctuations that occurred during the last contraction phase of the universe.

It was observed that during this bouncing cosmology, the universe most likely contracted and became 50 orders of magnitude smaller than its present size. It also hinted at the presence of dark matter and black holes in the universe which existed before the Big Bang.

"Smallprimordial black holescan be produced during the very early stages of the universe, and if they are not too small, their decay due to Hawking radiation [a hypothetical phenomenon of black holes emitting particles due to quantum effects] will not be efficient enough to get rid of them, so they would still be around now,"said Patrick Peter, director of research at the French National Centre for Scientific Research (CNRS), who was not involved in the study, while speaking to Live Science.

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"Weighing more or less the mass of anasteroid, they could contribute to dark matter, or even solve this issue altogether," he added.

"This work is important in the sense that it provides a natural way of forming small yet still present black holes forming dark matter in a framework which is not the usual one based on inflation," Peter stated.

(With inputs from agencies)