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Quasi-normal modes of slowly-rotating Johannsen black holes.

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Title: Quasi-normal modes of slowly-rotating Johannsen black holes.
Authors: Guo, Yuhao1 (AUTHOR) yhguo21@m.fudan.edu.cn, Shashank, Swarnim1 (AUTHOR) swarnim@fudan.edu.cn, Bambi, Cosimo1,2 (AUTHOR) bambi@fudan.edu.cn
Source: European Physical Journal C -- Particles & Fields. Apr2025, Vol. 85 Issue 4, p1-16. 16p.
Subjects: Laser interferometers, Black holes, Gravitational waves, General relativity (Physics), Rotational motion, Gravitational lenses
Abstract: The detection of gravitational waves with ground-based laser interferometers has opened a new window to test and constrain General Relativity (GR) in the strong, dynamical, and non-linear regime. In this paper, we follow an agnostic approach and we study the quasi-normal modes of gravitational perturbations of Johannsen black holes under the assumptions of the validity of the Einstein Equations and of low values of the black hole spin parameter and deformation parameters. We find that the deformation parameter α 13 has a stronger impact on the quasi-normal modes than the other leading order deformation parameters ( α 22 , α 52 , and ϵ 3 ). We derive a fitting formula for the fundamental modes with l = 2 and l = 3 for the deformation parameter α 13 valid in the slow rotation approximation ( a ∗ < 0.4 ). Finally, we constrain α 13 from the event GW170104; within our analysis, we find that the data of GW170104 are consistent with the predictions of GR. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Quasi-normal modes of slowly-rotating Johannsen black holes.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Laser+interferometers%22&quot;&gt;Laser interferometers&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Black+holes%22&quot;&gt;Black holes&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Gravitational+waves%22&quot;&gt;Gravitational waves&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22General+relativity+%28Physics%29%22&quot;&gt;General relativity (Physics)&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Rotational+motion%22&quot;&gt;Rotational motion&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Gravitational+lenses%22&quot;&gt;Gravitational lenses&lt;/searchLink&gt;
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  Data: The detection of gravitational waves with ground-based laser interferometers has opened a new window to test and constrain General Relativity (GR) in the strong, dynamical, and non-linear regime. In this paper, we follow an agnostic approach and we study the quasi-normal modes of gravitational perturbations of Johannsen black holes under the assumptions of the validity of the Einstein Equations and of low values of the black hole spin parameter and deformation parameters. We find that the deformation parameter α 13 has a stronger impact on the quasi-normal modes than the other leading order deformation parameters ( α 22 , α 52 , and ϵ 3 ). We derive a fitting formula for the fundamental modes with l = 2 and l = 3 for the deformation parameter α 13 valid in the slow rotation approximation ( a ∗ &lt; 0.4 ). Finally, we constrain α 13 from the event GW170104; within our analysis, we find that the data of GW170104 are consistent with the predictions of GR. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of European Physical Journal C -- Particles &amp; Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1140/epjc/s10052-025-14118-9
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        Text: English
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      – SubjectFull: Laser interferometers
        Type: general
      – SubjectFull: Black holes
        Type: general
      – SubjectFull: Gravitational waves
        Type: general
      – SubjectFull: General relativity (Physics)
        Type: general
      – SubjectFull: Rotational motion
        Type: general
      – SubjectFull: Gravitational lenses
        Type: general
    Titles:
      – TitleFull: Quasi-normal modes of slowly-rotating Johannsen black holes.
        Type: main
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            NameFull: Guo, Yuhao
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            NameFull: Shashank, Swarnim
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            NameFull: Bambi, Cosimo
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            – D: 01
              M: 04
              Text: Apr2025
              Type: published
              Y: 2025
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              Value: 85
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            – TitleFull: European Physical Journal C -- Particles & Fields
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