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arXiv 1002.3039astro-ph.COgr-qchep-phhep-th
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单场暴胀中小尺度密度扰动在预热过程中的坍缩

Collapse of Small-Scale Density Perturbations during Preheating in Single Field Inflation

Karsten Jedamzik, Martin Lemoine, Jerome Martin

摘要:

在宇宙暴胀之后和过渡到辐射支配之前,宇宙的能量密度可能在一个长时期内被振荡的大质量标量凝聚体所支配。我们表明,在此期间,子哈勃尺度扰动受到度量预热不稳定性的窄共振制度。我们详细分析,二次和四次潜力。这种不稳定性导致密度扰动的增长,在许多情况下,在辐射主导的宇宙开始之前,密度扰动已经变得非线性。当需要现象学上优选的低再热温度时,情况尤其如此。这些早期结构可能导致引力波的发射和原始黑洞的产生。此外,尚不清楚它们是否可以在非常大的尺度上修改线性曲率扰动的预测。

英文摘要:

After cosmic inflation and before the transition to radiation domination, the cosmic energy density may have been dominated during an extended period by an oscillating massive scalar condensate. We show that during this period, sub-Hubble scale perturbations are subject to a metric preheating instability in the narrow resonance regime. We analyze in detail both, quadratic and quartic potentials. The instability leads to the growth of density perturbations which in many cases become non-linear already before the beginning of a radiation dominated Universe. This is particularly the case when requiring a phenomenologically preferred low reheat temperature. These early structures may lead to the emission of gravitational waves and the production of primordial black holes. Furthermore, it is not clear if they could modify the prediction of linear curvature perturbations on very large scales.

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