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arXiv 1205.3501hep-ph
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磁泡重子发生

Bubble Baryogenesis

Clifford Cheung, Alex Dahlen, Gilly Elor

摘要:

我们提出了另一种重子生成机制,即在早期宇宙中,标量重子经历了一个膨胀的一级相变。划分相位的势垒包含明确的B和CP破坏,因此介导衰变的相应瞬子是不对称的。这些不对称气泡的成核和生长动态地产生重子,重子在渗滤后热化;气泡碰撞动力学也可以增加不对称产率。我们提出了一个明确的玩具模型,经历气泡重子生成,并通过气泡的成核和生长,气泡碰撞和冲刷的重子不对称性的演变进行了数值研究。我们讨论更现实的建设,其中标量重子和它的潜力之间出现的色破最低的MSSM,或在超对称中微子跷跷板机制。现象学的后果,如引力波,并可能应用于非对称暗物质的产生进行了讨论。

英文摘要:

We propose an alternative mechanism of baryogenesis in which a scalar baryon undergoes a percolating first-order phase transition in the early Universe. The potential barrier that divides the phases contains explicit B and CP violation and the corresponding instanton that mediates decay is therefore asymmetric. The nucleation and growth of these asymmetric bubbles dynamically generates baryons, which thermalize after percolation; bubble collision dynamics can also add to the asymmetry yield. We present an explicit toy model that undergoes bubble baryogenesis, and numerically study the evolution of the baryon asymmetry through bubble nucleation and growth, bubble collisions, and washout. We discuss more realistic constructions, in which the scalar baryon and its potential arise amongst the color-breaking minima of the MSSM, or in the supersymmetric neutrino seesaw mechanism. Phenomenological consequences, such as gravitational waves, and possible applications to asymmetric dark-matter generation are also discussed.

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