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- W4313444212 abstract "Wave (fuzzy) dark matter consists of ultralight bosons ($m sim 10^{-22} textrm{--} 10^{-20},{rm eV}$), featuring a compact solitonic core at the centre of a granular halo. Here we extend this model to a two-component wave dark matter, with distinct particle masses and coupled only through gravity, and investigate the resulting soliton-halo structure via cosmological simulations. Specifically, we assume wave dark matter contains $75$ per cent major component and $25$ per cent minor component, fix the major-component particle mass to $m_{rm major}=1times10^{-22},{rm eV}$, and explore two different minor-component particle masses with $m_{rm major}:m_{rm minor}=3:1$ and $1:3$, respectively. For $m_{rm major}:m_{rm minor}=3:1$, we find that (i) the major- and minor-component solitons coexist, have comparable masses, and are roughly concentric. (ii) The soliton peak density is significantly lower than the single-component counterpart, leading to a much smoother soliton-to-halo transition and rotation curve. (iii) The combined soliton mass of both components follows the same single-component core-halo mass relation. In dramatic contrast, for $m_{rm major}:m_{rm minor}=1:3$, we find that a minor-component soliton cannot form with the presence of a stable major-component soliton; the total density profile, for both halo and soliton, is thus dominated by the major component and closely follows the single-component case. To support this finding, we propose a toy model to illustrate that it is difficult to form a soliton in a hot environment associated with a deep gravitational potential. The work demonstrates the extra flexibility added to the multi-component wave dark matter model is capable of resolving observational tensions over the single-component model while retaining key features of the single-component model." @default.
- W4313444212 created "2023-01-06" @default.
- W4313444212 creator A5001342440 @default.
- W4313444212 creator A5004559651 @default.
- W4313444212 creator A5017999817 @default.
- W4313444212 date "2022-12-29" @default.
- W4313444212 modified "2023-10-18" @default.
- W4313444212 title "Cosmological Simulations of Two-Component Wave Dark Matter" @default.
- W4313444212 doi "https://doi.org/10.48550/arxiv.2212.14288" @default.
- W4313444212 hasPublicationYear "2022" @default.
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