Abstract
The observed matter-antimatter asymmetry of the Universe is a big puzzle in particle physics and cosmology. Although the hot Big Bang model of cosmology is very successful in predicting the cosmic microwave background (CMB) radiation and the primordial abundances of light elements, it does not explain why the cosmic baryon-to-photon ratio η ≡ n B/n γ is about 6 × 10−10 and why the primordial number density of antibaryons \( {n_{\bar B}} \) is vanishing. In this chapter we shall first present some experimental evidence for such a baryon number asymmetry, and then outline a few interesting dynamic scenarios to account for it. Among the presently-proposed baryogenesis mechanisms, the leptogenesis mechanism is most promising because it is intrinsically related to the popular seesaw mechanisms of neutrino mass generation. So we shall pay particular attention to the details of this mechanism and give a broad overview of its recent developments.
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Xing, ZZ., Zhou, S. (2011). Cosmological Matter-antimatter Asymmetry. In: Neutrinos in Particle Physics, Astronomy and Cosmology. Advanced Topics in Science and Technology in China. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-17560-2_11
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