泊松等曲率扰动对诱导引力波的影响
Effects of Poisson Isocurvature Perturbations on Induced Gravitational Waves
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中文总结 AI 辅助
该研究探讨了原初黑洞蒸发产生的泊松等曲率扰动对诱导引力波的影响，发现张量功率谱仅含两点关联，高阶关联出现在双谱中，且双谱构型振幅的尺度依赖性有助于区分不同引力波产生机制。
中文摘要 AI 辅助
从早期物质主导时代到辐射主导时代的突然转变，为增强诱导引力波（GWs）提供了一种代表性机制。在原初黑洞（PBH）蒸发场景中，离散的PBH数密度涨落自然产生泊松等曲率扰动。通过评估这些扰动经突然蒸发转变所诱导的引力波，我们展示了泊松等曲率源的完整内在非高斯统计层级如何进入诱导引力波谱。我们发现，张量功率谱仅保留标量源的两点关联，而高阶关联首次出现在张量双谱中。我们还发现不同双谱构型的相对振幅存在非平凡的尺度依赖性，这可能为区分离散PBH场景与其他诱导引力波机制提供额外信息。
英文摘要
A sudden transition from an early matter-dominated era to a radiation-dominated era provides a representative mechanism for enhancing induced gravitational waves (GWs). In the primordial black hole (PBH) evaporation scenario, discrete PBH number-density fluctuations naturally generate Poisson isocurvature perturbations. By evaluating the GWs induced by these perturbations through the sudden evaporation transition, we show how the full hierarchy of intrinsic non-Gaussian statistics of a Poisson isocurvature source enters the induced GW spectra. We find that the tensor power spectrum retains only the two-point correlations of the scalar source, while higher-order correlations first appear in the tensor bispectrum. We also find a nontrivial scale dependence in the relative amplitudes of different bispectrum configurations, which may provide additional information for distinguishing the discrete PBH scenario from other induced-GW mechanisms.
发表机构
- Institute of Theoretical Physics, Chinese Academy of Sciences (CAS)（中国科学院理论物理研究所）
- School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）
- School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences（中国科学院大学杭州高等研究院基础科学与数学学院）
机构由 AI 辅助整理，请以论文原文为准。
