TY - JOUR
T1 - Leptogenesis via neutrino oscillation magic
AU - Hamada, Yuta
AU - Kitano, Ryuichiro
AU - Yin, Wen
N1 - Funding Information:
WY thanks the hospitality of the KEK theory group during his visit. WY thanks Hi-royuki Ishida for the useful discussion on the kinetic equation. This work is supported by JSPS KAKENHI Grant-in-Aid for Scientific Research (No. 15H03669 and 15KK0176 [RK]), MEXT Grant-in-Aid for Scientific Research on Innovative Areas (No. 25105011 [RK] and 18H05542 [RK]) and Grant-in-Aid for JSPS Fellows (No. 16J06151 [YH]).
Publisher Copyright:
© 2018, The Author(s).
PY - 2018/10/1
Y1 - 2018/10/1
N2 - The possibility of generating the baryon asymmetry of the Universe via flavor oscillation in the early Universe is discussed. After the inflation, leptons are born in some states, travel in the medium, and are eventually projected onto flavor eigenstates due to the scattering via the Yukawa interactions. By using the Lagrangian of the Standard Model with the Majorana neutrino mass terms, llHH, we follow the time evolution of the density matrices of the leptons in this very first stage of the Universe and show that the CP violation in the flavor oscillation can explain the baryon asymmetry of the Universe. In the scenario where the reheating is caused by the decay of the inflaton into the Higgs bosons, the baryon asymmetry is generated by the CP phases in the Pontecorvo-Maki-Nakagawa-Sakata matrix and thus can be tested by the low energy neutrino experiments.
AB - The possibility of generating the baryon asymmetry of the Universe via flavor oscillation in the early Universe is discussed. After the inflation, leptons are born in some states, travel in the medium, and are eventually projected onto flavor eigenstates due to the scattering via the Yukawa interactions. By using the Lagrangian of the Standard Model with the Majorana neutrino mass terms, llHH, we follow the time evolution of the density matrices of the leptons in this very first stage of the Universe and show that the CP violation in the flavor oscillation can explain the baryon asymmetry of the Universe. In the scenario where the reheating is caused by the decay of the inflaton into the Higgs bosons, the baryon asymmetry is generated by the CP phases in the Pontecorvo-Maki-Nakagawa-Sakata matrix and thus can be tested by the low energy neutrino experiments.
KW - Beyond Standard Model
KW - CP violation
KW - Cosmology of Theories beyond the SM
KW - Neutrino Physics
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U2 - 10.1007/JHEP10(2018)178
DO - 10.1007/JHEP10(2018)178
M3 - Article
AN - SCOPUS:85055923925
SN - 1029-8479
VL - 2018
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 10
M1 - 178
ER -