Hydrodynamics of phase transition fronts and the speed of sound in the plasma
Hydrodynamics of phase transition fronts and the speed of sound in the plasma
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DOI：
10.1016/j.nuclphysb.2014.12.008
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发表时间：
2014-10
期刊：
影响因子：
--
通讯作者：
L. Leitao;A. Mégevand
中科院分区：
文献类型：
--
作者：
L. Leitao;A. Mégevand
宇宙一阶相变中气泡的生长涉及非平凡流体力学。因此，研究相变前沿的传播通常需要几个近似。一种常用的近似方法是将这两个相描述为仅由辐射和真空能组成（即所谓的袋态方程）。我们表明，在现实模型中，低温阶段的声速通常小于辐射的声速，并研究了这种情况下的流体力学。我们特别发现一种新的流体力学解是可能的，这在袋模型中是不存在的。我们得到了将潜热传递到等离子体体运动的效率的分析结果，作为每个阶段声速的函数。
The growth of bubbles in cosmological first-order phase transitions involves nontrivial hydrodynamics. For that reason, the study of the propagation of phase transition fronts often requires several approximations. A frequently used approximation consists in describing the two phases as being composed only of radiation and vacuum energy (the so-called bag equation of state). We show that, in realistic models, the speed of sound in the low-temperature phase is generally smaller than that of radiation, and we study the hydrodynamics in such a situation. We find in particular that a new kind of hydrodynamical solution may be possible, which does not arise in the bag model. We obtain analytic results for the efficiency of the transfer of latent heat to bulk motions of the plasma, as a function of the speed of sound in each phase.