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通过脉冲星计时阵列观测,从随机背景引发的标量诱导引力波的极限
Yi-Fu Cai1, Xin-Chen He1, Xiao-Han Ma1
1Deep Space Exploration Laboratory/Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China.
Science bulletin
|November 11, 2023
概括
科学家们探索了来自早期宇宙的标量诱导引力波,作为检测到的随机引力波背景的来源. 这项分析为通货膨胀模型和原始黑洞生产提供了新的约束.
科学领域:
- 宇宙学和天体物理学
- 引力波天文学 引力波天文学
- 粒子物理学和早期宇宙模型
背景情况:
- 多个合作 (NANOGrav,PPTA,EPTA,CPTA) 已经报告了对静态重力波背景 (SGWB) 的证据.
- 观察到的SGWB特征与超大质量黑洞双星 (SMBHBs) 的预测一致,但新的物理解释仍然是可能的.
- 早期的宇宙是超越标准天体物理现象的引力波的潜在来源.
研究的目的:
- 调查来自非常早期宇宙的标量诱导引力波 (IGWs),作为观测到的SGWB的替代解释.
- 为了限制IGW能量光谱的参数和相关的早期宇宙模型.
- 探索对通货膨胀模型和原始黑洞 (PBH) 生产的影响.
主要方法:
- 利用参数化破解的功率定律函数来建模SGWB能量频谱.
- 这个模型与NANOGrav,PPTA和EPTA最近的SGWB数据相匹配.
- 分析了从IGW参数和通货膨胀模型上的光谱拟合得出的约束.
主要成果:
- 参数化的模型成功地与观察到的SGWB数据相匹配.
- 分析对特征IGW能量频谱的参数进行了限制.
- 对预测PBH形成的特定通货膨胀模型施加限制.
结论:
- 来自早期宇宙的尺度诱导引力波为观测到的SGWB提供了合理的解释.
- 这项研究为基础物理学提供了有价值的约束,包括通货膨胀和PBH宇宙学.
- 这些发现补充了正在进行的和未来的引力波实验,例如基于太空的任务.
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