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- W4382490613 abstract "In cosmologies with an early matter-dominated era (EMDE) prior to Big Bang nucleosynthesis, the boosted growth of small-scale matter perturbations during the EMDE leads to microhalo formation long before halos would otherwise begin to form. For a range of models, halos can even form during the EMDE itself. These halos would dissipate at the end of the EMDE, releasing their gravitationally heated dark matter and thereby imprinting a free-streaming cut-off on the matter power spectrum. We conduct the first cosmological $N$-body simulations of the formation and evaporation of halos during and after an EMDE. We show that in these scenarios, the free-streaming cut-off after the EMDE can be predicted accurately from the linear matter power spectrum. Although the free streaming can erase much of the EMDE-driven boost to density perturbations, we use our findings to show that the (re-)formation of halos after the EMDE nevertheless proceeds before redshift $sim 1000$. Early-forming microhalos are a key observational signature of an EMDE, and our prescription for the impact of gravitational heating will allow studies of the observational status and prospects of EMDE scenarios to cover a much wider range of parameters." @default.
- W4382490613 created "2023-06-29" @default.
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- W4382490613 creator A5073374253 @default.
- W4382490613 date "2023-06-26" @default.
- W4382490613 modified "2023-09-26" @default.
- W4382490613 title "Simulations of Gravitational Heating Due to Early Matter Domination" @default.
- W4382490613 doi "https://doi.org/10.48550/arxiv.2306.14961" @default.
- W4382490613 hasPublicationYear "2023" @default.
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