Turning in the landscape: A new mechanism for generating primordial black holes
Turning in the landscape: A new mechanism for generating primordial black holes
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DOI：
10.1016/j.physletb.2023.137921
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发表时间：
2020-04
影响因子：
4.4
通讯作者：
J. Fumagalli;S. Renaux-Petel;J. Ronayne;L. Witkowski
中科院分区：
文献类型：
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作者：
J. Fumagalli;S. Renaux-Petel;J. Ronayne;L. Witkowski
我们提出了一个新的模型独立的机制，从一个多场膨胀的时期产生的原始黑洞。这就要求在短尺度下的原始波动要比在CMB尺度下的原始波动值更大。我们表明，这样的放大自然发生时，暴胀轨迹表现出强烈的转折，这是一个有限的时期，在此期间，轨迹强烈偏离测地线在字段空间，并足以随后产生原始黑洞的丰度是全部或一部分的暗物质。我们的机制是通用的膨胀模型实现在一个多维的领域空间与覆盖的潜力和几何形状，也被称为通货膨胀的景观，如出现在嵌入的高能量理论的通货膨胀。我们用解析和数值方法研究了转动的持续时间和强度对原初涨落功率谱和原初黑洞丰度的影响。我们的机制有可能通过原始黑洞光谱和引力波的随机背景展示出可供观察的独特特征，从而为暴胀的动力学提供宝贵的一瞥。
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.