Gravitational waves from regular black holes in extreme mass-ratio inspirals
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arXiv
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| Format: | Preprint |
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2024
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| author | Kumar, Shailesh Zi, Tieguang |
| author_facet | Kumar, Shailesh Zi, Tieguang |
| contents | We analyze a rotating regular black hole spacetime with an asymptotically Minkowski core, focusing on extreme mass-ratio inspiral (EMRIs) where a stellar-mass object inspirals a supermassive black hole under consideration. Such spacetimes are also called Kerr-like spacetimes, which motivate the investigation of black holes beyond general relativity and the test of the no-hair theorem. In the present article, we consider the eccentric equatorial motion of an inspiralling object in the background of a rotating regular black hole. The dynamics generate gravitational waves (GWs) that imply a loss in energy and angular momentum of the orbiting body. In this scenario, as a result of the radiation reaction, we analytically compute the orbital evolution of the moving object. Further, we generate the gravitational waveforms and constrain the non-Kerr parameter through dephasing and mismatch computations using Laser Interferometer Space Antenna (LISA) observations. Our result indicates that LISA can distinguish the effect of the additional non-Kerr/deviation parameter with the parameter as small as $\sim10^{-6}$. The constraint on the parameter in the regular black hole using the Fisher information matrix (FIM) can be obtained within a fraction error of $10^{-5}$. The estimates of our analysis with EMRIs present the possible detectability of Kerr-like geometries with future space-based detectors, and further open up ways to put a stringent constraint on non-Kerr parameters with more advanced frameworks. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_11847 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gravitational waves from regular black holes in extreme mass-ratio inspirals Kumar, Shailesh Zi, Tieguang General Relativity and Quantum Cosmology We analyze a rotating regular black hole spacetime with an asymptotically Minkowski core, focusing on extreme mass-ratio inspiral (EMRIs) where a stellar-mass object inspirals a supermassive black hole under consideration. Such spacetimes are also called Kerr-like spacetimes, which motivate the investigation of black holes beyond general relativity and the test of the no-hair theorem. In the present article, we consider the eccentric equatorial motion of an inspiralling object in the background of a rotating regular black hole. The dynamics generate gravitational waves (GWs) that imply a loss in energy and angular momentum of the orbiting body. In this scenario, as a result of the radiation reaction, we analytically compute the orbital evolution of the moving object. Further, we generate the gravitational waveforms and constrain the non-Kerr parameter through dephasing and mismatch computations using Laser Interferometer Space Antenna (LISA) observations. Our result indicates that LISA can distinguish the effect of the additional non-Kerr/deviation parameter with the parameter as small as $\sim10^{-6}$. The constraint on the parameter in the regular black hole using the Fisher information matrix (FIM) can be obtained within a fraction error of $10^{-5}$. The estimates of our analysis with EMRIs present the possible detectability of Kerr-like geometries with future space-based detectors, and further open up ways to put a stringent constraint on non-Kerr parameters with more advanced frameworks. |
| title | Gravitational waves from regular black holes in extreme mass-ratio inspirals |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2412.11847 |