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arXiv 1609.05028hep-phastro-ph.CO
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原初轻子振荡与重子生成

Primordial Lepton Oscillations and Baryogenesis

Yuta Hamada, Ryuichiro Kitano

摘要:

宇宙的重子不对称性应该是在暴胀时代之后产生的。我们考虑了这种不对称性是由暴胀后再加热过程中的味振荡产生的可能性,从而在辐射支配时代的开始就已经实现了重子不对称性。在跷跷板模型中,我们证明了左手轻子的传播子在热背景下一般具有味混合,这种味混合可以通过振荡现象中的$CP$破坏产生味相关轻子不对称性.用于洗出过程的风味依赖性速率可以留下今天的净不对称性。

英文摘要:

The baryon asymmetry of the Universe should have been produced after the inflation era. We consider the possibility that the asymmetry is generated by the flavor oscillations in the reheating process after inflation, so that the baryon asymmetry is realized already at the beginning of the radiation dominated era. In the seesaw model, we show that the propagators of the left-handed leptons generically have flavor mixings in the thermal background, that can generate flavor-dependent lepton asymmetry through the $CP$ violation in the oscillation phenomena. The flavor dependent rates for the wash-out process can leave the net asymmetry today.

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