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CP Violation by A. I. Sanda, I. I. Bigi

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21

Baryogenesis in the universe

21.1 The challenge

One of the most intriguing aspects of big bang cosmology is to ‘understand’ nucleosynthesis, i.e. to reproduce the abundances observed for the nuclei in the universe as dynamically generated rather than merely dialled as input values. This challenge has been met successfully, in particular for the light nuclei, and actually so much so that it is used to obtain information on dark matter in the universe, the number of neutrinos, etc. It is natural to ask whether such a success could be repeated for an even more basic quantity, namely the baryon number density of the universe, which is defined as the difference in the abundances of baryons and antibaryons:

(21.1)

Qualitatively, we can ...

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