Structure formation under inelastic two-component dark matter: halo statistics and matter power spectra in the high- z universe

Structure formation under inelastic two-component dark matter: halo statistics and matter power spectra in the high- z universe. Low, R., Adhikari, R., Rose, J. C, O’Neil, S., Medvedev, M. V, Torrey, P., & Vogelsberger, M. Monthly Notices of the Royal Astronomical Society, 546(2):staf2259, January, 2026.

Paper doi abstract bibtex

We present hydrodynamic simulations of a ﬂavour-mixed two-component dark matter (2cDM) model that utilize IllustrisTNG baryonic physics. The model parameters are explored for two sets of power laws of the velocity-dependent cross-sections, favoured on the basis of previous studies. The model is shown to suppress the formation of structures at scales k 102 h Mpc−1 up to 40 per cent compared to cold dark matter at redshifts z ∼ 5−2. We compare our results to structure enhancement and suppression due to cosmological and astrophysical parameters presented in the literature and ﬁnd that 2cDM effects remain relevant at galactic and subgalactic scales. The results indicate the robustness of the role of non-gravitational dark matter interactions in structure formation and the absence of putative degeneracies introduced by baryonic feedback at high z. The predictions made can be further tested with future Ly α forest observations.

@article{low_structure_2026,
	title = {Structure formation under inelastic two-component dark matter: halo statistics and matter power spectra in the high- \textit{z} universe},
	volume = {546},
	copyright = {https://creativecommons.org/licenses/by/4.0/},
	issn = {0035-8711, 1365-2966},
	shorttitle = {Structure formation under inelastic two-component dark matter},
	url = {https://academic.oup.com/mnras/article/doi/10.1093/mnras/staf2259/8400344},
	doi = {10.1093/mnras/staf2259},
	abstract = {We present hydrodynamic simulations of a ﬂavour-mixed two-component dark matter (2cDM) model that utilize IllustrisTNG baryonic physics. The model parameters are explored for two sets of power laws of the velocity-dependent cross-sections, favoured on the basis of previous studies. The model is shown to suppress the formation of structures at scales k 102 h Mpc−1 up to 40 per cent compared to cold dark matter at redshifts z ∼ 5−2. We compare our results to structure enhancement and suppression due to cosmological and astrophysical parameters presented in the literature and ﬁnd that 2cDM effects remain relevant at galactic and subgalactic scales. The results indicate the robustness of the role of non-gravitational dark matter interactions in structure formation and the absence of putative degeneracies introduced by baryonic feedback at high z. The predictions made can be further tested with future Ly α forest observations.},
	language = {en},
	number = {2},
	urldate = {2026-05-05},
	journal = {Monthly Notices of the Royal Astronomical Society},
	author = {Low, Ryan and Adhikari, Rakshak and Rose, Jonah C and O’Neil, Stephanie and Medvedev, Mikhail V and Torrey, Paul and Vogelsberger, Mark},
	month = jan,
	year = {2026},
	keywords = {SYS: CosmicAI Contact Author, Use-Inspired, WG: Explainable},
	pages = {staf2259},
}

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