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arXiv 2302.11547gr-qcastro-ph.CO
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德西特时空中的克尔黑洞与观测红移:迈向测量哈勃常数的新方法

Kerr black hole in de Sitter spacetime and observational redshift: Toward a new method to measure the Hubble constant

Mehrab Momennia, Alfredo Herrera-Aguilar, Ulises Nucamendi

AI总结:

本文提出通过分析绕克尔-德西特黑洞做圆轨道运动的大质量粒子发射光子的红移,建立红移与时空参数及哈勃常数之间的关系,从而为利用广义相对论和可观测量独立测量晚期哈勃常数提供新方法。

摘要:

我们通过考虑在渐近德西特时空中绕克尔黑洞旋转的试验粒子的频率移动,提取哈勃定律。为此,我们考虑绕克尔-德西特黑洞做圆轨道运动的大质量测地粒子,这些粒子向远离发射体-黑洞系统的遥远观测者发射红移光子。通过考虑这一构型,我们得到了以时空参数(如质量、角动量和宇宙学常数)表示的红移表达式。然后,借助一些物理上合理的近似,我们找到了光子频率移动与哈勃常数之间的关系。最后,我们提取了以绕该黑洞做圆轨道运动的大质量天体的观测红移表示的史瓦西黑洞质量和哈勃常数的精确公式。我们的结果提出了一种新的独立的广义相对论方法,用于通过可观测量获得晚期哈勃常数。

英文摘要:

We extract the Hubble law by the frequency-shift considerations of test particles revolving the Kerr black hole in asymptotically de Sitter spacetime. To this end, we take into account massive geodesic particles circularly orbiting the Kerr-de Sitter black holes that emit redshifted photons towards a distant observer which is moving away from the emitter-black hole system. By considering this configuration, we obtain an expression for redshift in terms of the spacetime parameters, such as mass, angular momentum, and the cosmological constant. Then, we find the frequency shift of photons versus the Hubble constant with the help of some physically motivated approximations. Finally, some exact formulas for the Schwarzschild black hole mass and the Hubble constant in terms of the observational redshift of massive bodies circularly orbiting this black hole are extracted. Our results suggest a new independent general relativistic approach to obtaining the late-time Hubble constant in terms of observable quantities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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