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arXiv 1010.2134astro-ph.COhep-ph
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宇宙学相变中的球形和非球形气泡

Spherical and non-spherical bubbles in cosmological phase transitions

Leonardo Leitao, Ariel Megevand

摘要:

一级相变的宇宙学残余通常取决于等离子体中膨胀气泡壁产生的扰动。当气泡碰撞并失去其球形对称性时,会发生几种形成机制。然而,在文献中经常考虑球形气泡,特别是用于引力波的计算。我们研究了不同气泡对称性下气泡壁的稳态运动。利用袋状态方程,讨论了爆轰和亚、超声速爆燃时相变前沿的传播。我们考虑的情况下,球形,圆柱形和平面壁,并比较能量转移到相对论流体的体运动。我们发现,不同的壁的几何形状给类似的扰动的等离子体。对于平面壁的情况下,我们得到的体积运动的动能的解析表达式。作为应用,我们讨论了引力波的产生。

英文摘要:

The cosmological remnants of a first-order phase transition generally depend on the perturbations that the walls of expanding bubbles originate in the plasma. Several of the formation mechanisms occur when bubbles collide and lose their spherical symmetry. However, spherical bubbles are often considered in the literature, in particular for the calculation of gravitational waves. We study the steady state motion of bubble walls for different bubble symmetries. Using the bag equation of state, we discuss the propagation of phase transition fronts as detonations and subsonic or supersonic deflagrations. We consider the cases of spherical, cylindrical and planar walls, and compare the energy transferred to bulk motions of the relativistic fluid. We find that the different wall geometries give similar perturbations of the plasma. For the case of planar walls, we obtain analytical expressions for the kinetic energy in the bulk motions. As an application, we discuss the generation of gravitational waves.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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