The Impact of Fuzzy Dark Matter Dynamics on the Accumulation and Fragmentation of Primordial Gas

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ID: 323160
2026
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Abstract
Abstract Fuzzy Dark Matter (FDM), particularly in the 10−22 eV mass regime, is frequently used to characterize wave-like interference effects. It exhibits macroscopic wave properties, which drive distinct baryonic dynamics within collapsed haloes. Using the hydrodynamical code arepo with the axirepo module and primordial chemistry, we simulate the assembly of haloes with masses 3 × 108 M⊙ ≤ Mh ≤ 8 × 109 M⊙ across a range of axion masses 1 × 10−22 eV ≤ ma ≤ 7 × 10−22 eV. We investigate how small-scale dynamics of the FDM density field affect the accumulation of cold, dense gas essential for primordial star formation. We demonstrate that gas collapse is suppressed by a two-fold mechanism: a delay driven by the geometry of the FDM solitonic core and a secondary dynamical barrier caused by stochastic wave fluctuations. While the flattened solitonic potential profile itself inhibits central gas accumulation, these wave-driven dynamics provide a further layer of disruption and angular momentum support, which in certain regimes prevents gas from reaching the central, compact, high-density configurations characteristic of CDM. Consequently, sites of star formation are shifted away from a single central peak toward a population of lower-mass clusters. Our work provides a physical framework for calibrating halo mass-dependent star formation efficiencies in FDM cosmologies, where internal processes may delay Cosmic Dawn beyond the effects of the initial power spectrum cut-off. These results are essential for interpreting realistic observational constraints from future 21-cm signal observations and the faint-end luminosity functions observed by the JWST within FDM models.
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Authors Alexander Tocher, Anastasia Fialkov, Simon May, Ralf S. Klessen, Simon C. O. Glover, Paul C Clark, Tibor Dome
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1422
URL
https://doi.org/10.1093/mnras/stag1422
Keywords Keywords not found

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