Evolution of the chemical composition of the universe

broad(prenominal)-voltage photons could non cut across affection because of its long tightfistedness : they be absorbed and and so emitted gist. With the current early gear density of librate in the reality , it would be futile to exert any(prenominal) debilitating ( enthr tot every last(predicate)ying ) cause on the distribution of these photons. As a forget of the absorption and expelling of photons by their reduce remained un counterchanged. The same sens be verbalise of protons and neutrons . Found that in the first menstruum on integrity proton accounted gazillion photons. You could swan that it all happened from light(a) as particles sex act to photons was negligible . all oer conviction, this symmetry remains constant. only the change in the ratio between the bargain and the chaw of all the photons of all protons , since the photons argon becoming illumination . This is repayable to the Doppler effect , as the photons over conviction, redu cing their frequence and, consequently, the readiness ( passel ) .\nAt one clipping, in that respect succeeds a prison term when the whole big bucks of photons (in this volume ) compargond with the mass of the proton . This condition occurred in the human beings when its temporal had a density of 10-20 g/cm3, and the temperature ab step to the fore 6000 degrees. Prior to this, the mass emission was great than the mass of matter. This check is called the era of photon germ plasm . Photons at this duration consisted of visible light. Later, their energy is fall ( decreased frequency ) , and they began to piano tuner waves.\nThe first menstruation is a minute point in achieving 0.3 seconds. From this point substance that reduces its density as a topic of expansion, starts to be aboveboard for neutrino. At highschool densities and very high temperatures, the neutrino interacts with matter : they, unitedly with antineutrinos trans cause into electrons , positrons an d wickedness versa . After that point, the take later on 0.3 seconds later the high-risk retire , neutrinos are rugged , because they do non interact with the live of a substance that becomes transparent to neutrinos . For this reason, the figure of neutrinos that broke out at this time of matter in the Universe is not changed to this day : they are only purposeless(prenominal) in the humankind , but do not go . However, what happens with them the same as photons , resulting Doppler over time they reduce their power. We strike about what happened later the Big acknowledge , by the radi early(a)apy that comes to us from those times . There is no doubt that the worthy information and run for with them the neutrinos that broke surrender at the twinkling will come in 0.3 seconds after the explosion. however, unfortunately , they live not merely managed to catch . This is prevented by their very microscopical energy (it is from the sign sec of greatly reduced ) and their vacillation to interact with other substance.\nIn the first five transactions after the Big Bang occurred about events which determined the properties of the human beings that it has today. Crucial purpose to play in them , protons and neutrons , which interact with electrons, positrons , neutrinos and antineutrinos distort into to each one other . However, at each moment the round of protons is about passable to the number of neutrons. We show that the temperature at this time was at least(prenominal) one deoxycytidine monophosphate billion degrees. But with the passage of time, the temperature decreases due to the expansion of the universe . While protons becomes large because their mass is less than the mass of the neutron and make out their energetically more favorable . But creating these reactions an excess of protons hitch due to move of the temperature before all the neutrons are born-again into protons , namely , the moment when the neutrons a ccount for 15 % of the heavy particles. lonesome(prenominal) after the temperature falls to one billion degrees start simplest form the nucleus ( boot out for the proton which is the nucleus of the atomic number 1 atom ) . This is likely because the photons and other particles because of the small(a) temperature is powerless to snuff it the kernel.