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• W3209704806 abstract "We revisit dark-matter production through freeze-in and freeze-out by solving the Boltzmann equations at the level of the phase-space distribution $f(p,t)$. Using the $2to2$ annihilation and the $1to2$ decay processes for illustration, we compare the resulting dark-matter relic abundance with that from the number-density approach. In the transition regime between freeze-in and freeze-out, we find the difference can be as large as $sim$10% for $2to2$ and $sim$50% for $1to2$, or even a factor of $mathcal{O}(10)$ if the annihilation of dark-matter particles or the decaying mediator is neglected. The freeze-in production in the $2to2$ and the $1to2$ processes can also result in non-thermal phase-space distributions, or even multi-modal ones with out-of-equilibrium decay, which can potentially affect structure formation at late times. We also investigate how elastic scatterings can distort such non-thermal distributions." @default.
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• W3209704806 date "2021-11-02" @default.
• W3209704806 modified "2023-09-27" @default.
• W3209704806 title "Revisit Dark Matter Freeze-in and Freeze-out through Phase-Space Distribution." @default.
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