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Variability in supermassive black-hole accretion rates in fuzzy dark matter cores due to black-hole wandering

Eric Ludwig1,2, Philip Mocz2, and Victor H. Robles1

Phys. Rev. D 114, 043070 – Published 26 August, 2026

DOI: https://doi.org/10.1103/rvfk-89yg

Abstract

Soliton cores in fuzzy dark matter (FDM) deepen nuclear potentials and have been proposed to strongly boost Bondi accretion, potentially aiding rapid black-hole growth at high redshift. We test this in live Schrödinger-Poisson FDM cores coupled to isothermal gas, evolving a moving black hole (BH) that grows via a strictly mass-conserving sink. We measure boosts relative to the initial mean-density Bondi rate. Low-mass seeds (MBH,init106M) do not sustain large boosts: BH wandering and soliton sloshing drive bursty accretion with dense gas only intermittently present near the BH. Intermediate seeds (MBH,init107M) produce the most durable enhancement, reaching O(102) boosts for sound speed cs=60kms1, while hotter gas approaches near-background Bondi rates. High-mass seeds (MBH,init108M) quickly exhaust the sink-scale reservoir and become supply limited, suppressing long-lived growth despite the deepened potential. In general, central-potential deepening (e.g., by a soliton halo) does not guarantee long-lived fueling: sustained boosts emerge only when the black hole remains dynamically confined within the dense nuclear gas region. Our results suggest the supermassive black-hole formation channels relying on soliton-enhanced accretion alone are unlikely to provide sufficient early growth.

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