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- W2482167189 abstract "The relic abundance of the dark matter (DM) particle $d$ is studied in a secluded DM scenario, in which the $d$ number decreasing process dominantly occurs not through the pair annihilation of $d$ into the standard model particles, but via the $ddensuremath{rightarrow}mm$ scattering process with a subsequently decaying mediator particle $m$. It is pointed out that the cosmologically observed relic abundance of DM can be accomplished even with a massive mediator having a mass ${m}_{m}$ non-negligibly heavy compared with the DM particle mass ${m}_{d}$. In the degenerated $densuremath{-}m$ case (${m}_{d}={m}_{m}$), the DM relic abundance is realized by adjusting the $ddensuremath{rightarrow}mm$ scattering amplitude large enough and by choosing an appropriate mediator particle lifetime. The DM evolution in the early universe exhibits characteristic ``terrace'' behavior, or two-step number density decreasing behavior, having a ``fake'' freeze-out at the first step. Based on these observations, a novel possibility of the DM model buildings is introduced in which the mediator particle $m$ is unified with the DM particle $d$ in an approximate dark symmetry multiplet. A pionic DM model is proposed to illustrate this idea in a renormalizable field theory framework." @default.
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- W2482167189 date "2017-01-25" @default.
- W2482167189 modified "2023-10-15" @default.
- W2482167189 title "Relic abundance in a secluded dark matter scenario with a massive mediator" @default.
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- W2482167189 doi "https://doi.org/10.1103/physrevd.95.023006" @default.
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