arXiv 0801.41092008-01-27gr-qcastro-phhep-ph

来自大爆炸的新引力波背景

A new gravitational wave background from the Big Bang

Juan Garcia-Bellido, Daniel G. Figueroa

备注：: 20 pages, 8 figures, to appear in the Proceedings of JGRG17, Nagoya (Japan), 3-7 December 2007

摘要：

混合暴胀后宇宙的再加热是通过成核和随后的大浓度能量密度的碰撞进行的，这些能量密度是以相对论速度移动的气泡状结构。这产生了一个显着的一部分能量的形式随机背景的引力波，其时间演化是由连续的阶段的再加热：首先，快子预热使重力波的振幅呈指数快速增长。其次，气泡碰撞增加了新的引力辐射爆发。第三，湍流运动最终结束了引力波的产生。从那时起，这些波就不受阻碍地传播到我们这里。我们发现，今天在这些原始引力波的能量密度的分数可能是显着的大统一体尺度模型的膨胀，虽然远远超出了引力波天文台，如LIGO，LISA或BBO的频率范围的灵敏度。然而，低比例模型仍然可以在BBO或DECIGO可访问的频率上产生可检测的信号。为了比较，我们还计算了一些混沌暴胀模型的类似背景，得到了与其他模型类似的结果。这种背景的发现将打开一个新的观测窗口，进入非常早期的宇宙，在那里可以探索再加热过程的细节。因此，它也可以作为检验通货膨胀范式的一个新的实验工具。

英文摘要：

The reheating of the universe after hybrid inflation proceeds through the nucleation and subsequent collision of large concentrations of energy density in the form of bubble-like structures moving at relativistic speeds. This generates a significant fraction of energy in the form of a stochastic background of gravitational waves, whose time evolution is determined by the successive stages of reheating: First, tachyonic preheating makes the amplitude of gravity waves grow exponentially fast. Second, bubble collisions add a new burst of gravitational radiation. Third, turbulent motions finally sets the end of gravitational waves production. From then on, these waves propagate unimpeded to us. We find that the fraction of energy density today in these primordial gravitational waves could be significant for GUT scale models of inflation, although well beyond the frequency range sensitivity of gravitational wave observatories like LIGO, LISA or BBO. However, low-scale models could still produce a detectable signal at frequencies accessible to BBO or DECIGO. For comparison, we have also computed the analogous background from some chaotic inflation models and obtained similar results to those of other groups. The discovery of such a background would open a new observational window into the very early universe, where the details of the process of reheating could be explored. Thus, it could also serve as a new experimental tool for testing the Inflationary Paradigm.

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