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As it expanded, it cooled, and the quark-gluon plasma ‘froze’ into neutrons and protons (and other hadrons, but their role in BBN was marginal), which interacted furiously … The universe continued to cool, and soon became too cold for any further nuclear reactions …the unstable isotopes left then decayed, as did the neutrons not already in some nucleus or other.
During the subsequent expansion, this plasma has progressively cooled down.
By examining how the cooling affects the matter content of the universe, one can derive one of the most impressive testable predictions of the big bang models.
The big bang models - the cosmological models based on general relativity - tell us that the early universe was extremely hot and dense.
At the earliest stages that can be modelled using current physical theories, the universe was filled with radiation and elementary particles - a hot plasma in which energy was distributed evenly.
The starting of the formation of the nucleons in the universe is termed as nucleo genesis.
After this method Nuclear fusion and all those stuffs occur which form other life supporting materials and other elements.The nucleons that date back to the stage of the starting of the universe were made in the same procedure.This was when the Big Bang contained quark-glucon plasma which cooled the temperature below approximately 10 million degree Celsius.There are several different nuclear reaction cycles, or processes (e.g.triple alpha, s process, proton-proton chain, CNO cycle), but the end result is the fusion of hydrogen (and helium) to produce carbon, nitrogen, oxygen, … In the red giant phase of a star’s life, much of this matter ends up in the interstellar medium … There are other ways new nuclei can be created, in the universe (other than BBN and stellar nucleosynthesis); for example, when a high energy particle (a cosmic ray) collides with a nucleus in the interstellar medium (or the Earth’s atmosphere), it breaks it into two or more pieces (this process is called cosmic ray spallation).The test for any theory is how well it does empirically.As it stands you have advanced a pet theory, without any mathematical model or analysis.In astronomy – and astrophysics and cosmology – there are two main kinds of nucleosynthesis, Big Bang nucleosynthesis (BBN), and stellar nucleosynthesis.In the amazingly successful set of theories which are popularly called the Big Bang theory, the early universe was very dense, and very hot.Taking into account a wealth of nuclear reactions similar to the ones pictured above, one can then apply general statistical formula which govern the relative abundances of the different matter constituents.What nuclei are produced, and in what amounts, is the result of a race between the various nuclear reactions on the one hand and the inevitable cooling that accompanies the expansion of the universe on the other.