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Can supercomputers give us visions, what happened just after the Big Bang?
The fact is that supercomputers are not traveling in time. They are calculating the actions and interactions of the universe backward. The supercomputers are calculating the decrease of the energy level in the cosmic bubble, what we are calling the universe, and then it tries to make the simulations how the decreasing energy level or temperature along with chancing gravitational and other effects are affecting atomic and subatomic interactions.
At the beginning of time, the universe was smaller, and that caused that the energy level in the universe was higher. When we are talking about the temperature of the universe we are meaning the energy level of that bubble. If we are thinking that the energy is the wave movement and subatomic particles like electrons, the density of those particles was higher in the small universe.
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The problem is that most of the universe is invisible to us because it is forming dark material.
The thing that makes the calculations of the backward in time and simulations of the Big Bang difficult is that most of the universe is invisible to us. The interaction between material and dark material happens only by gravity.
So nobody has ever made any kind of tests by using a dark material, and nobody has seen that material. We know that dark material and dark energy exists, and that is all that we know.
When we are talking about the energy we must realize that there are two types of energy.
1) Visible energy
2) Dark energy
Could there be two versions of the dark energy? In this theory:
"Hot dark energy" is the interaction between the particles of the hot dark material.
"Cold dark energy" is wave movement interactions between the particles of cold dark material.
In some theories, there are also "cold" and "hot" forms of dark energy. So the dark energy can have similar forms to dark matter. That causes an idea that could the hypothetical "hot" dark energy be the interaction between particles of hot dark material. And that means the "cold" dark material would be an interaction between particles of cold dark material. And then we must realize that there are at least three types of material in the universe.
1) Visible material
2) Hot dark matter
3) Cold dark matter
Possible: grey matter
Sometimes there have been discussions that should the "hot" and "cold" dark material mention different types of material or are those hot and cold dark material part of the same thing? And there is possible the "grey" material", what nobody has ever observed, and proves of the existence of that material are only in theoretical level.
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When the universe expands the density of those particles decreases. The idea is simple when the size of the space or balloon what those particles should fill will increasing that means that the same number of particles must fill the bigger space. So the density of the universe is decreasing when it expands.
In many simulations, the universe is portrayed as a balloon. That thing is quite right except the universe is like a balloon in a vacuum. When the balloon is taken to vacuum that causes that the density of gas in it will get lower when the balloon expands if the gas would not bring to that balloon from outside. So entire material and energy to the universe released during the Big Bang. And there is no outcoming energy or material for filling the cosmic balloon, what we are calling "universe".
So as we can say the universe the universe must cope with the material that was released during the big bang. That is, according to modern knowledge, the universe does not receive any more matter or energy from anything outside of it. So that causes that the density of energy and material is decreasing.
https://www.syfy.com/syfywire/can-supercomputer-take-us-back-in-time-to-universe-was-born
https://en.wikipedia.org/wiki/Dark_matter
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