Effects of electroweak phase transition dynamics on baryogenesis and primordial nucleosynthesis.
Effects of electroweak phase transition dynamics on baryogenesis and primordial nucleosynthesis.
复制标题
电弱相变动力学对重子发生和原始核合成的影响。
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
A. Heckler
中科院分区：
文献类型：
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作者：
A. Heckler
利用各种未知的电弱理论参数，如潜热和泡壁表面张力，计算了包括激波释放潜热引起的再加热在内的电弱相变的演化过程。我们发现，发生在相变气泡壁附近的重子产生可以是气泡壁速度的敏感函数，并且这种速度依赖性在计算宇宙重子密度时很重要。重子产生的所有机制都有一个敏感的速度依赖关系，这取决于泡壁速度的大小，我们特别研究了重子产生的反向速度依赖关系，这是由重子产生的电荷输运机制预测的。对于这一机制，我们发现在电弱相变过程中重子的产生和非均质性的产生都得到了增强。我们计算了重子增强的幅度，根据理论的参数，它可以大到几个数量级，我们计算了产生的不均匀性的大小和幅度。我们确定，在热成核的电弱相变中产生的不均匀性很小，无法在扩散过程中存活下来，并影响核合成时代。我们还研究了通过其他方式形成核的相变的可能性，例如通过宇宙弦的存在，可能会产生可能影响的非均质性
The evolution of the electro-weak phase transition, including reheating due to the release of latent heat in shock waves, is calculated for various values of as yet unknown parameters of electro-weak theory such as latent heat and bubble wall surface tension. We show that baryon production, which occurs in the vicinity of the bubble walls of the phase transition, can be a sensitive function of bubble wall velocity, and this velocity dependence is important to include in the calculation of the baryon density of the universe. There is a sensitive velocity dependence for all mechanisms of baryon production, depending on the magnitude of velocity of the bubble wall, and we examine in particular an inverse velocity dependence on baryon production, which is predicted by the charge transport mechanism of baryon production. For this mechanism we find both an enhancement of baryon production and the generation of inhomogeneities during the electro-weak phase transition. We calculate the magnitude of the baryon enhancement, which can be as large as a few orders of magnitude, depending on the parameters of the theory, and we calculate the size and amplitude of the inhomogeneities generated. We determine that the inhomogeneities generated in a thermally nucleated electro-weak phase transition are to small to survive diffusive processes and effect the nucleosynthesis epoch. We also examine the possibility that a phase transition nucleated by other means, such as by the presence of cosmic strings, may produce inhomogeneities that could effect