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- W4367692577 abstract "Recently it has been questioned, notably in the context of the scalar singlet dark matter model with $m_varphi^{ }simeq 60$ GeV, how efficiently kinetic equilibrium is maintained if freeze-out dynamics is pushed down to low temperatures by resonant effects. We outline how Langevin simulations can be employed for addressing the non-equilibrium momentum distribution of non-relativistic particles in a cosmological background. For a scalar singlet mass $m_varphi^{ }simeq 60$ GeV, these simulations suggest that kinetic equilibrium is a good approximation down to $T sim 1$ GeV, with the deviation first manifesting itself as a red-tilted spectrum. This reduces the annihilation cross section, confirming findings from other methods that a somewhat larger ($ < 20%$) coupling than in equilibrium is needed for obtaining the correct abundance." @default.
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- W4367692577 date "2023-05-01" @default.
- W4367692577 modified "2023-09-30" @default.
- W4367692577 title "Langevin simulation of dark matter kinetic equilibration" @default.
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- W4367692577 doi "https://doi.org/10.1088/1475-7516/2023/05/003" @default.
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