这里要特别注意一点：根据今天的物理学，今天我们的正物质世界里的物质仅是大爆炸产生的正物质10亿分之一[5]（CERN：a tiny portion of matter – about one particle per billion – managed to survive）。也就是说，在大爆炸后的不到一秒钟的时间里产生的一大堆的正反物质彼此之间相互碰撞消除之后，每十亿个粒子中有一个偶然留了下来。
All other possible causes that have been studied so far by physicists (e.g. the CP violation, electric dipole moment, etc), if they were real in the baryogenesis, could help to increase the chances for the clusters to occur and enlarge the sizes of the clusters once they are formed. However, the fact that physicists cannot confirm the roles of those possible causes through nowadays experiments tells us that those causes might not have played a dominating role during the baryogenesis, even if they did exist, while the role of the thermodynamic fluctuation as discussed above would be statistically meaningful. Besides, from the above discussion we can see that the departure from thermal equilibrium due to the out-of-equilibrium decay as depicted in the Sakharov Criteria, i.e. the lower rate of decay of certain heavy particles, if did contribute to the residual matter for the baryogenesis, could only account for one minor cause among many possible causes that could contribute to the formation of the clusters of the same kind.
Antimatter particles share the same mass as their matter counterparts, but qualities such as electric charge are opposite. The positively charged positron, for example, is the antiparticle to the negatively charged electron. Matter and antimatter particles are always produced as a pair and, if they come in contact, annihilate one another, leaving behind pure energy. During the first fractions of a second of the Big Bang, the hot and dense universe was buzzing with particle-antiparticle pairs popping in and out of existence. If matter and antimatter are created and destroyed together, it seems the universe should contain nothing but leftover energy.
Nevertheless, a tiny portion of matter – about one particle per billion – managed to survive. This is what we see today. In the past few decades, particle-physics experiments have shown that the laws of nature do not apply equally to matter and antimatter. Physicists are keen to discover the reasons why. Researchers have observed spontaneous transformations between particles and their antiparticles, occurring millions of times per second before they decay. Some unknown entity intervening in this process in the early universe could have caused these "oscillating" particles to decay as matter more often than they decayed as antimatter.
