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arXiv · 2608.15099

Probing Dark Matter with Gravitational Waves: Spin-Modulated Dephasing from Black Holes in Halos

Guoyang Fu·Yunqi Liu·Jian-Pin Wu·Bin Wang·Rui-Hong Yue
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Abstract

We develop a novel analytical framework for constructing axisymmetric black hole spacetimes sourced by dark matter (DM) halos. Applying this to extreme mass ratio inspirals (EMRIs), we find that the DM induces a detectable gravitational-wave dephasing, scaling monotonically with the halo's compactness. Notably, BH spin significantly suppresses this dephasing, indicating that analyses neglecting rotation would overestimate DM signatures. Faithfulness calculations confirm that future space-borne detectors can robustly distinguish such DM environments, establishing EMRIs as a novel probe for galactic DM distributions.

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Guoyang Fu, Yunqi Liu, Jian-Pin Wu, Bin Wang, Rui-Hong Yue. 2026-08-15. Probing Dark Matter with Gravitational Waves: Spin-Modulated Dephasing from Black Holes in Halos. https://arxiv.org/abs/2608.15099

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