Gauss-Bonnet修正的单场暴胀中的原初黑洞
Primordial blackholes from Gauss-Bonnet-corrected single field inflation
摘要：
在早期宇宙中通过过密区域的引力坍缩形成的原始黑洞可能对现在的暗物质遗迹密度有很大的贡献。暴胀为原初黑洞的产生机制提供了一个自然的框架。例如，具有微调标量势的单场暴胀模型可能会表现出一段超慢滚动的时期，在此期间，曲率扰动可能会增强，成为原始黑洞的种子，因为相应的尺度重新进入视界。在这项工作中，我们提出了一个原始黑洞形成的替代机制。我们考虑一个模型，其中一个标量场耦合到高斯-邦纳项，并表明，原始黑洞可能是种子时，标量位项和高斯-邦纳耦合项几乎平衡。在这个模型中，大曲率微扰不仅导致了原初黑洞的产生，而且还产生了二阶引力波。我们计算了当前引力波的密度参数，并通过与未来引力波实验的灵敏度界限进行比较，讨论了信号的可探测性。
英文摘要：
Primordial blackholes formed in the early Universe via gravitational collapse of over-dense regions may contribute a significant amount to the present dark matter relic density. Inflation provides a natural framework for the production mechanism of primordial blackholes. For example, single field inflation models with a fine-tuned scalar potential may exhibit a period of ultra-slow roll, during which the curvature perturbation may be enhanced to become seeds of the primordial blackholes formed as the corresponding scales reenter the horizon. In this work, we propose an alternative mechanism for the primordial blackhole formation. We consider a model in which a scalar field is coupled to the Gauss-Bonnet term and show that primordial blackholes may be seeded when a scalar potential term and the Gauss-Bonnet coupling term are nearly balanced. Large curvature perturbation in this model not only leads to the production of primordial blackholes but it also sources gravitational waves at the second order. We calculate the present density parameter of the gravitational waves and discuss the detectability of the signals by comparing them with sensitivity bounds of future gravitational wave experiments.
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