论文标题
原始黑孔作为暗物质和重力波从颠簸轴承通胀产生
Primordial black holes as dark matter and gravitational waves from bumpy axion inflation
论文作者
论文摘要
我们考虑了一种生产大量原始黑洞（PBH）和可观察到的随机重力波背景（SGWB）的机制，它启发了通货膨胀模型。在此框架中，充气量被识别为非紧密的轴突状场，亚领的非扰动效应可以将光滑高原连接到基础轴支电位上叠加陡峭的悬崖。在与Abelian仪表场耦合的情况下，由于轴突在此特征周围的临时快速滚动，其潜在的悬崖状区域的轴上运动在其潜在的潜在范围内的局部产生。在此设置中，由矢量场提出的原始波动在动量空间中表现出局部峰值，该峰值对应于当轴速度最大时退出地平线的模式。作为这种一般机制的应用，我们提供了一个轴承通胀的示例，该示例与CMB尺度上的Planck观测值匹配，并生成一群光PBH（$ M _ {\ rm PBH} \ simeq 10^{ - 13} M _ {\ odot} $），可以考虑所有深色的问题。在这种情况下，导致PBHS的增强标量波动也产生了可观察到的lisa尺度诱导起源的SGWB。所得GW信号的幅度和形状遗传了其标量源的特定特性（例如非高斯性及其形状），这些特性可能使我们可以将这种机制与其他通货膨胀场景和天体物理背景区分开。因此，该GW信号以及在相应尺度上观察到PBH分布的观察可以为尺度上的通货膨胀动力学提供一个窗口，而不是宇宙微波背景（CMB）和大型结构（LSS）测量值要小得多。
We consider a mechanism for producing a significant population of primordial black holes (PBHs) and an observable stochastic gravitational wave background (SGWB) within string theory inspired models of inflation. In this framework where inflaton is identified as a non-compact axion-like field, sub-leading non-perturbative effects can superimpose steep cliffs connected by smooth plateaus onto the underlying axion potential. In the presence of coupling to Abelian gauge fields, the motion of axion on the cliff-like region(s) of its potential triggers a localized production of one helicity state of gauge fields due to the temporary fast-roll of axion around such a feature. In this setup, primordial fluctuations sourced by vector fields exhibit a localized peak in momentum space corresponding to modes that exit the horizon when the axion velocity is maximal. As an application of this general mechanism, we present an example of axion inflation which both matches Planck observations at CMB scales and generates a population of light PBHs ($M_{\rm PBH} \simeq 10^{-13} M_{\odot}$) that can account for all dark matter. In this scenario, the enhanced scalar fluctuations that leads to PBHs also generate an observable SGWB of induced origin at LISA scales. The amplitude and shape of the resulting GW signal inherits specific properties (such as non-Gaussianity and its shape) of its scalar sources that may allow us to distinguish this mechanism from other inflationary scenarios and astrophysical backgrounds. This GW signal together with an observation of PBH distribution at the corresponding scales can thus provide a window to the inflationary dynamics on scales much smaller than those probed by Cosmic Microwave Background (CMB) and Large Scale Structure (LSS) Measurements.
