arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.08369hep-thastro-ph.COgr-qc
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在景观中转向:产生原初黑洞的新机制

Turning in the landscape: a new mechanism for generating Primordial Black Holes

Jacopo Fumagalli, Sébastien Renaux-Petel, John W. Ronayne, Lukas T. Witkowski

AI总结:

本文提出一种不依赖具体模型的多场暴胀机制,通过暴胀轨迹在场空间中的强烈转向放大短尺度原初涨落,从而产生可构成暗物质全部或部分的原初黑洞,并可通过原初黑洞谱与引力波背景进行观测检验。

摘要:

我们提出一种新的、不依赖具体模型的机制,用于从多场暴胀阶段产生原初黑洞。这要求在短尺度上原初涨落相对于其在宇宙微波背景(CMB)尺度上的值得到增强。我们证明,当暴胀轨迹出现强烈转向时,即轨迹在场空间中强烈偏离测地线的一段有限时期,这种放大就会自然发生,并且足以随后产生原初黑洞,其丰度可以构成暗物质的全部或一部分。我们的机制对在多维场空间中实现的暴胀模型具有普适性,该场空间具有覆盖其上的势与几何结构,也被称为暴胀景观,正如在高能理论中嵌入暴胀时所出现的情形。我们通过解析和数值方法研究了转向的持续时间和强度如何影响原初涨落功率谱以及原初黑洞的丰度。我们的机制有潜力展现出可通过原初黑洞谱和引力波随机背景进行观测的独特特征,从而为暴胀动力学提供宝贵的窥见。

英文摘要:

We propose a new model-independent mechanism for producing primordial black holes from a period of multi-field inflation. This requires an enhancement of primordial fluctuations at short scales compared to their value at CMB scales. We show that such an amplification naturally occurs when the inflationary trajectory exhibits a strong turn, that is a limited period during which the trajectory strongly deviates from a geodesic in field space, and is sufficient for subsequently producing primordial black holes with the abundance to be all or a fraction of dark matter. Our mechanism is generic to models of inflation realized in a multi-dimensional field space with an overlying potential and geometry, also referred to as the inflationary landscape, as arises in embeddings of inflation in high-energy theories. We study analytically and numerically how the duration and the strength of the turn impact the primordial fluctuation power spectrum and the abundance of primordial black holes. Our mechanism has the potential of exhibiting unique features accessible to observation through the primordial black hole spectrum and the stochastic background of gravitational waves, offering a precious glimpse at the dynamics of inflation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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