Non-Kerr constraints using binary black hole inspirals considering phase modifications up to 4 PN order

IF 4.2 2区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS The European Physical Journal C Pub Date : 2024-11-29 DOI:10.1140/epjc/s10052-024-13623-7

Debtroy Das, Swarnim Shashank, Cosimo Bambi

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Abstract

The gravitational field around an astrophysical black hole (BH) is thought to be described by the Kerr spacetime, which is a solution of the Einstein equation. Signatures of binary black hole (BBH) coalescence in gravitational waves (GW) follow the Kerr spacetime as the theoretical foundation. Hence, any possible deviations from the Kerr spacetime around BHs serve as a test of the nature of gravity in the strong-field regime and of the predictions of General Relativity. In our study, we perform a theory-agnostic test of the Kerr hypothesis using BBH inspirals from the third Gravitational-wave Transient Catalog (GWTC-3). Considering the Johannsen metric, we compute the leading-order deviation to the emitted GW in the frequency domain. Our results provide constraints on two deformation parameters (\(\alpha _{13}\) and \(\epsilon _3\)) and demonstrate the degeneracy between these two non-Kerr parameters.

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使用双黑洞吸积器的非克尔约束，考虑到高达 4 PN 阶的相位修正

天体物理黑洞（BH）周围的引力场被认为是由克尔时空（Kerr spacetime）描述的，它是爱因斯坦方程的一个解。引力波（GW）中双黑洞（BBH）凝聚的特征以克尔时空为理论基础。因此，黑洞周围克尔时空的任何可能偏差都是对强场机制下引力性质和广义相对论预言的检验。在我们的研究中，我们利用第三期引力波瞬态目录（GWTC-3）中的BBH吸积物对克尔假说进行了理论上的检验。考虑到约翰森度量，我们计算了频域内发射的引力波的前阶偏差。我们的结果提供了对两个变形参数（\(α _{13}\)和\(\epsilon _3\)）的约束，并证明了这两个非Kerr参数之间的退行性。

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来源期刊

The European Physical Journal C 物理-物理：粒子与场物理

CiteScore

8.10

自引率

15.90%

发文量

1008

审稿时长

2-4 weeks

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