Dark Matter Signatures of Supermassive Black Hole Binaries

Abstract

A natural consequence of the galaxy formation paradigm is the existence of supermassive black hole (SMBH) binaries. Gravitational perturbations from a far-away SMBH companion can induce high orbital eccentricities on dark matter particles orbiting the primary SMBH via the eccentric Kozai-Lidov mechanism. This process yields an influx of dark matter particles into the primary SMBH ergosphere, where test particles linger for long timescales. This influx results in high self-gravitating densities, forming a dark matter clump that is extremely close to the SMBH. In such a situation, the gravitational wave emission between the dark matter clump and the SMBH is potentially detectable by LISA. If dark matter self-annihilates, the high densities of the clump will result in a unique co-detection of gravitational wave emission and high energy electromagnetic signatures.

7 pages, 5 figures, accepted to ApJ-Lett

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Cited by in corpus (6)

• Prospects for Fundamental Physics with LISA
• Primordial Black Holes from Cosmic Domain Walls
• The Formation of Intermediate Mass Black Holes in Galactic Nuclei
• Probing the Nature of Black Holes: Deep in the mHz Gravitational-Wave Sky
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