重新审视GW190521的宇宙字符串起源
Josu C Aurrekoetxea1, Charlie Hoy2, Mark Hannam3
1Astrophysics, University of Oxford, Oxford OX1 3RH, United Kingdom.
Physical review letters
|May 17, 2024
概括
缩成黑洞的宇宙弦环可能模仿黑洞合并的引力波. 这项研究更倾向于GW190521的宇宙弦解释,而不是以前的模型,开辟了新的研究途径.
科学领域:
- 天体物理学 天体物理学
- 宇宙学的宇宙学是什么?
- 引力波天文学 引力波天文学
背景情况:
- 引力波 (GW) 天文学已经检测到许多事件,主要来自于黑洞的合并.
- 宇宙弦是时空中假设的拓缺陷,它们的引力波辐射被理论研究.
- 之前对GW事件的分析并没有将缩成黑洞的宇宙串环视为源头.
研究的目的:
- 用模拟宇宙弦环崩的波形来分析引力波应变数据.
- 调查这个以前没有考虑过的来源是否可以解释像GW190521这样的观测到的引力波事件.
- 将宇宙弦假说与现有的GW事件模型进行比较.
主要方法:
- 利用强大的重力模拟来构建波形,用于崩的宇宙弦环.
- 应用这些波形来分析引力波事件GW190521.
- 采用贝叶斯分析来比较宇宙弦模型与二进制黑洞模型的概率.
主要成果:
- 宇宙字符串循环崩模型在之前对GW190521的宇宙字符串分析中受到22的日志贝叶斯因子的青.
- 来自崩的宇宙弦的信号主要是由黑洞的回归,模仿二进制黑洞的合并信号.
- 二元黑洞假说仍然是最受欢迎的,因为宇宙弦残余的非旋转性质.
结论:
- 塌的宇宙串环为某些引力波事件提供了一个可行的,尽管目前不受欢迎的解释.
- 进一步研究来自宇宙串环的旋转残余物可能会挑战目前对二进制黑洞合并的偏好.
- 寻找只有回归的波形被提出作为一种检测和估计宇宙串事件速率的方法.
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