Large lepton asymmetry from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi></mml:math>-balls

M. Kawasaki, Fuminobu Takahashi, Masahide Yamaguchi

doi:10.48550/arxiv.hep-ph/0205101

Large lepton asymmetry from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi></mml:math>-balls

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書誌事項

公開日: 2002-08-19

権利情報

http://link.aps.org/licenses/aps-default-license

DOI

10.1103/physrevd.66.043516
10.48550/arxiv.hep-ph/0205101

公開者: American Physical Society (APS)

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説明

We propose a scenario which can explain large lepton asymmetry and small baryon asymmetry simultaneously. Large lepton asymmetry is generated through Affleck-Dine (AD) mechanism and almost all the produced lepton numbers are absorbed into Q-balls (L-balls). If the lifetime of the L-balls is longer than the onset of electroweak phase transition but shorter than the epoch of big bang nucleosynthesis (BBN), the large lepton asymmetry in the L-balls is protected from sphaleron effects. On the other hand, small (negative) lepton numbers are evaporated from the L-balls due to thermal effects, which are converted into the observed small baryon asymmetry by virtue of sphaleron effects. Large and positive lepton asymmetry of electron type is often requested from BBN. In our scenario, choosing an appropriate flat direction in the minimal supersymmetric standard model (MSSM), we can produce positive lepton asymmetry of electron type but totally negative lepton asymmetry.

10 pages, 3 figures, ReVTeX4