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arXiv 0712.2991astro-ph
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暴胀末期的引力波:计算策略

Gravitational Waves From the End of Inflation: Computational Strategies

Richard Easther, John T. Giblin, Eugene A. Lim

摘要:

参量共振或预热是一种合理的机制,可以在暴胀阶段和热辐射主导的宇宙之间产生过渡。这一时期的结果是远离热平衡的重粒子的快速产生,并可能产生一个显着的随机背景引力辐射。在这里,我们提出了一个数值算法计算的当代功率谱的重力波产生的后膨胀相变的一大类标量场驱动的暴胀模型。我们明确地计算这个频谱的四次和二次模型的混沌膨胀,和低规模的混合模型。特别是,我们考虑混合模型与“反转”的潜力。这些模型有一个非常短的和强烈的共振期,这是定性的不同,从以前的例子在这种情况下研究,但我们发现,它们导致了类似的引力辐射谱。

英文摘要:

Parametric resonance or preheating is a plausible mechanism for bringing about the transition between the inflationary phase and a hot, radiation dominated universe. This epoch results in the rapid production of heavy particles far from thermal equilibrium and could source a significant stochastic background of gravitational radiation. Here, we present a numerical algorithm for computing the contemporary power spectrum of gravity waves generated in this post-inflationary phase transition for a large class of scalar-field driven inflationary models. We explicitly calculate this spectrum for both quartic and quadratic models of chaotic inflation, and low-scale hybrid models. In particular, we consider hybrid models with an ``inverted'' potential. These models have a very short and intense period of resonance which is qualitatively different from previous examples studied in this context, but we find that they lead to a similar spectrum of gravitational radiation.

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