García-Bellido Juan, Figueroa Daniel G
Departamento de Física Teórica C-XI, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
Phys Rev Lett. 2007 Feb 9;98(6):061302. doi: 10.1103/PhysRevLett.98.061302. Epub 2007 Feb 8.
The process of reheating the Universe after hybrid inflation is extremely violent. It proceeds through the nucleation and subsequent collision of large concentrations of energy density in bubblelike structures, which generate a significant fraction of energy in the form of gravitational waves. We study the power spectrum of the stochastic background of gravitational waves produced at reheating after hybrid inflation. We find that the amplitude could be significant for high-scale models, although the typical frequencies are well beyond what could be reached by planned gravitational wave observatories. On the other hand, low-scale models could still produce a detectable stochastic background at frequencies accessible to those detectors. The discovery of such a background would open a new window into the very early Universe.
混合暴胀后宇宙的再加热过程极其剧烈。它通过在泡状结构中大量能量密度的成核及随后的碰撞来进行，这些碰撞以引力波的形式产生相当一部分能量。我们研究了混合暴胀后再加热过程中产生的引力波随机背景的功率谱。我们发现，对于高标度模型，其振幅可能很大，尽管典型频率远超出计划中的引力波天文台所能达到的范围。另一方面，低标度模型在这些探测器可及的频率下仍可能产生可探测的随机背景。发现这样一个背景将为极早期宇宙打开一扇新窗口。
