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arXiv · 2610.19521

Detectability of Gravitational Waves from Extreme-Mass-Ratio Inspirals on Periodic Orbits around Bardeen Black Holes

Li Huang·Xing He
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Abstract

We investigate gravitational wave (GW) signatures from extreme-mass-ratio inspirals (EMRIs) around a Bardeen black hole, modeling the small object as a test particle, and provide a framework for probing strong-field spacetime geometry. We first present the equations of motion for test particles around a Bardeen black hole and characterize circular orbits in the parameter space of energy and angular momentum. Using Levin's classification, we adopt the extended classification scheme to classify periodic orbits around a Bardeen black hole. We then compute GW waveforms in both the time and frequency domains, as well as the corresponding characteristic strains, for these periodic orbits and compare them with the sensitivity curves of the Laser Interferometer Space Antenna (LISA), the evolved Laser Interferometer Space Antenna (eLISA), the TianQin mission, the Big Bang Observer (BBO), and the Decihertz Interferometer Gravitational wave Observatory (DECIGO). We find that detectability is controlled primarily by the luminosity distance. At a luminosity distance of 200 Mpc, the signals can exceed the sensitivity curves of BBO and DECIGO and are comparable to the LISA sensitivity curve, whereas at 2 Gpc, they remain below the sensitivity curves of all detectors considered. These results suggest that EMRIs on periodic orbits around Bardeen black holes offer a promising avenue to probe strong-field gravity and the properties of Bardeen black holes.

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Li Huang, Xing He. 2026-10-14. Detectability of Gravitational Waves from Extreme-Mass-Ratio Inspirals on Periodic Orbits around Bardeen Black Holes. https://arxiv.org/abs/2610.19521

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