Time machine simulations about the young universe are difficult because the young universe was different than it's now.
Creating "time machine simulations" about the ancient galaxy lifecycles is quite difficult to work. The very first stars existed in a very different type of universe. And in the young universe was more antimatter than the universe where we live. The antimatter-material annihilation made the energy level of the young universe higher than it's now. That thing causes the effect that the temperature curves of the history of the universe are not straight.
The universe was smaller than it's now. But the reflection was higher. In the same way, the number and power of the crossing quantum fields were higher and the speed of light was lower in that universe. When researchers want to make the calculations and simulations about the origin of material they must remember that the energy always affects the material.
When we think about the point where the Big Bang happens we must realize that material that came from that point traveled a very complicated way. The Big Bang was like a fountain and material released in a short time to the universe. Even if the Big Bang endured only a couple of seconds that thing caused whirls and chaos. Photons are the thing that caused chaos in that quark-gluon plasma.
The high-energy photons that were released after the main part of the elementary particles released traveled through that quark cloud. And that caused whirling. In some theories, matter and antimatter are annihilated until the material in the form as we know it remains. The first galaxies were a little bit different from than galaxies where we live. All elements did not exist in the first galaxies. Because stars did not create those elements in nuclear fusion.
Antimatter was one of the things that formed the modern material as we see it. In the young universe formed material more than antimatter. And that caused the great annihilation of the "second Big Bang". The main question about this theory is this: Was the great annihilation formed between elementary particles.
Or were the first protons and neutrons formed when electromagnetic forces pulled antimatter and matter together? That thing caused an annihilation reaction. That great annihilation was one of the things that caused the energy level of the young universe to start to rise. The reason why the great annihilation is one of the explanations for the question "why there is so small number of antimatter in the universe"? The annihilation destroys matter and antimatter.
But even if the most of antimatter was destroyed in the great annihilation the antimatter still exists in the universe. That means in the young universe the stars faced antimatter more often than stars in the modern universe. That caused the universe to be hot. The thing that we see in the universe is the material that formed after the great annihilation.
Sources:
https://scitechdaily.com/astrophysicists-create-time-machine-simulations-to-observe-the-lifecycle-of-ancestor-galaxy-cities/
https://miraclesofthequantumworld.blogspot.com/
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