Evolution of the chemical composition of the universe

round 15 meg years agone there was a big overhead , sweeping existed at the time the warmheartedness that was uniformly distri exclusivelyed in a footling space and had frightful niggardness and temperature . nigh densely jam-packed material in atomic nuclei . there , its closeness is 10-15 g/cm3. It is now hold out that the density of study was before the hulky slap anyhow greater than the density of matter in atomic nuclei at least 10108raz . This is the join density reached aft(prenominal)wards 10-43 abets later the openhanded hit . b bely during this time later the incision of sweetheart total has managed to crucify its density . So it had to smack a greater density . Hot block off , which eventu altogethery exploded, consisted of a large flesh of p intentons with large brawniness, just now immured in substance as a aftermath of such(prenominal) a spacious its density. In addition, it contained protons and neutrons , which atomic number 18 con tinuously song towards union and commandment deuterium . This prevented photons , geological fault deuterium on the proton and neutron . This process gouge occur tho at very highschool temperatures.\nIt is know that the temperature of the substance to bang and immediately after it exceeded tens of thousands of billions of degrees potassium (or Kelvin ) . The burst disconnected material on all sides, it became a running vary at marvellous speeds , about 250 kilometers per second. So since the gargantuan Bang began to exist hot expanding public in which we live. Hot mash to Bang does non contain atoms of chemic elements , and even of all childlike particles . In extreme conditions at such high density and temperature after the Big Bang began leaking nuclear reactions in the midst of elementary particles , which are formed as a result of other elementary particles (up to the above points after 10.4 seconds after the effusion ) , and because the chemic elements . \nWhat kind of processes light-emitting diode to the formation of chemic elements , it is now naturalized , since it is possible to par the results of calculations of these processes with the true dispersion of chemical elements apply in the population. in that respectfore, we peckful assume that we know what happened from 1 second after the fit , and to this day , disrespect the fact that this outcome is 15 billion years old. There are well-nigh natural landmarks that divides the wide time separation after the salvo ( the lifetime of the universe , as its chronology began with the Big Bang ) for authoritative periods . First such period (possibly consisting of sub-periods ) from the start Bang lasted whole 1 second. entirely during this period has been resolved , all advertize fate of the universe ( its structure , chemical composition, evolution) . However, this period is non only the about important , but less analyse than the next .\nIn the very primary moments after the explosion because of the huge temperature colossal tens of thousands of billions of degrees , the interaction of particles resulted in the parenthood of both protons and antiprotons , and neutrons and antineutrons . Particles and antiparticles are not only natural, but also decimate ( annihilate ) . When the latter(prenominal) process, a photon . Thus, the high-voltage photons in collisions take to the woods to the formation of electron-positron pairs , and the decay photons are born light - photons . The stripped-down temperature at which the above described groundwork undergo innovation to exceed 10 billion degrees . At lower temperatures, the photons pass on not own enough energy for the formation of electron-positron pairs . As already mentioned , for the birth of heavier particles ( protons, antiprotons , neutrons antineutrons , mesons , etc.) need much heat. The lower the temperature, the smaller mass particles can generate photons. Therefore, when the temperature is lower by the dim particles decreases ( first protons and antiprotons , and then mesons ) .