One small step for an inflaton, one giant leap for inflation: A novel non-Gaussian tail and primordial black holes
One small step for an inflaton, one giant leap for inflation: A novel non-Gaussian tail and primordial black holes
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DOI：
10.1016/j.physletb.2022.137461
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发表时间：
2021-12
影响因子：
4.4
通讯作者：
Y. Cai;Xiao-Han Ma;M. Sasaki;Dong-Gang Wang;Zihan Zhou
中科院分区：
文献类型：
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作者：
Y. Cai;Xiao-Han Ma;M. Sasaki;Dong-Gang Wang;Zihan Zhou
我们报道了一项来自单场膨胀的新预测，即使是膨胀势的一小步也可以改变我们对曲率微扰的原始非高斯性的看法。我们的分析集中在慢卷演化的两个阶段之间的向上阶跃转变所产生的概率分布的尾部。识别了具有非吸引子行为的非平凡背景动力学。通过使用非微扰δN分析，我们明确地表明，即使当传统的非线性参数fnL局域、g nL局域等仍然很小时，通过微小的向上台阶也可以产生高度非高斯的尾巴。通过这个例子，我们首次证明了非微扰效应对概率分布尾部的敏感依赖性。我们的设想对原始黑洞有着不可想象的应用，要么显著增加它们的丰度，要么完全禁止它们的出现。
We report a novel prediction from single-field inflation that even a tiny step in the inflaton potential can change our perception of primordial non-Gaussianities of the curvature perturbation. Our analysis focuses on the tail of probability distribution generated by an upward step transition between two stages of slow-roll evolution. The nontrivial background dynamics with off-attractor behavior is identified. By using a non-perturbative δN analysis, we explicitly show that a highly non-Gaussian tail can be generated by a tiny upward step, even when the conventional nonlinearity parameters f NL local, g NL local, etc. remain small. With this example, we demonstrate for the first time the sensitive dependence of non-perturbative effects on the tail of probability distribution. Our scenario has an inconceivable application to primordial black holes by either significantly boosting their abundance or completely forbidding their appearance.