重模式对原初黑洞形成的影响
Impact of Heavy Modes on Primordial Black Hole Formation
- College of Physics, Sichuan University（四川大学物理学院）
- Jagiellonian University（雅盖隆大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究在准单场暴胀框架下，发现重场产生的非高斯性（双谱与三谱）可显著增强原初黑洞形成，为宇宙对撞机物理提供新观测渠道。
AI中文摘要：
原初黑洞（PBHs）由原初分布高密度尾部的罕见涨落形成，因此其丰度对原初非高斯性高度敏感。暴胀期间的重场可以产生此类非高斯性，产生宇宙对撞机物理学中广泛探索的特征信号，但其对PBH形成的影响在很大程度上仍未得到研究。我们在准单场暴胀（QSFI）框架内研究这一问题，该框架是耦合重场与暴胀子的最小实现。与大多数仅考虑双谱的PBH研究不同，QSFI可以在双谱之外产生可观的三谱，使我们能够研究它们对PBH形成的联合效应。在我们的领头阶计算中，重场非高斯性可以放大高密度尾部并显著增强PBH产生。在参数扫描中，最大增强出现在所考虑的最小重场质量和最大声速比处。三谱的贡献可以与双谱相当，甚至可能主导总非高斯修正。我们的结果确立了PBH丰度作为宇宙对撞机物理学的一个新观测渠道，展示了暴胀期间的重场如何显著塑造PBH形成。
英文摘要：
Primordial black holes (PBHs) form from rare fluctuations in the high-density tail of the primordial distribution, making their abundance highly sensitive to primordial non-Gaussianity. Heavy fields during inflation can source such non-Gaussianity, producing characteristic signatures widely explored in cosmological collider physics, yet its impact on PBH formation remains largely unexamined. We investigate this question within quasi-single-field inflation (QSFI), the minimal realization that couples a heavy field to the inflaton. Unlike most PBH studies that consider only the bispectrum, the QSFI can generate a sizable trispectrum alongside the bispectrum, allowing us to investigate their combined effects on PBH formation. In our leading-order calculation, heavy-field non-Gaussianities can amplify the high-density tail and substantially enhance PBH production. Within the parameter scan, the largest enhancement occurs at the smallest heavy-field mass and the largest sound-speed ratio considered. The trispectrum contribution can be comparable to that of the bispectrum and may even dominate the total non-Gaussian correction. Our results establish PBH abundance as a novel observational channel for cosmological collider physics, demonstrating how heavy fields during inflation can significantly shape PBH formation.
