arXiv 1004.41872010-04-23hep-phastro-ph.CO

宇宙学一级相变的能量收支

Energy Budget of Cosmological First-order Phase Transitions

Jose R. Espinosa, Thomas Konstandin, Jose M. No, Geraldine Servant

备注：: 36 pages, 14 figures
发表信息：: JCAP 1006:028,2010
DOI：: 10.1088/1475-7516/2010/06/028

摘要：

一阶相变中气泡生长的流体动力学研究与电弱重子生成非常相关，因为重子不对称性敏感地依赖于气泡壁速度，并且还用于预测气泡碰撞产生的重力波信号的大小，这取决于气泡壁速度和等离子体流体速度。我们进行这样的研究在不同的气泡膨胀制度，即爆燃，爆炸，混合（稳态）和失控的解决方案（加速壁），而不依赖于一个特定的粒子物理模型。我们计算了在所有制度的真空能量转移到气泡壁和等离子体的效率。我们澄清的条件确定失控制度和应力，在大多数模型的强一阶相变，这将修改预期的重力波信号。实际上，在这种情况下，大部分动能集中在壁中，并且由于周围的流体大部分保持静止，因此几乎没有湍流流体运动。

英文摘要：

The study of the hydrodynamics of bubble growth in first-order phase transitions is very relevant for electroweak baryogenesis, as the baryon asymmetry depends sensitively on the bubble wall velocity, and also for predicting the size of the gravity wave signal resulting from bubble collisions, which depends on both the bubble wall velocity and the plasma fluid velocity. We perform such study in different bubble expansion regimes, namely deflagrations, detonations, hybrids (steady states) and runaway solutions (accelerating wall), without relying on a specific particle physics model. We compute the efficiency of the transfer of vacuum energy to the bubble wall and the plasma in all regimes. We clarify the condition determining the runaway regime and stress that in most models of strong first-order phase transitions this will modify expectations for the gravity wave signal. Indeed, in this case, most of the kinetic energy is concentrated in the wall and almost no turbulent fluid motions are expected since the surrounding fluid is kept mostly at rest.

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